Thomas Cowperthwait Eakins (July 25, 1844 – June 25, 1916) was an American realist painter, photographer, sculptor, and fine arts educator. He is widely acknowledged to be one of the most important artists in American art history.

For the length of his professional career, from the early 1870s until his health began to fail some forty years later, Eakins worked exactingly from life, choosing as his subject the people of his hometown of Philadelphia. He painted several hundred portraits, usually of friends, family members, or prominent people in the arts, sciences, medicine, and clergy. Taken en masse, the portraits offer an overview of the intellectual life of Philadelphia in the late 19th and early 20th centuries; individually, they are incisive depictions of thinking persons. As well, Eakins produced a number of large paintings which brought the portrait out of the drawing room and into the offices, streets, parks, rivers, arenas, and surgical amphitheaters of his city. These active outdoor venues allowed him to paint the subject which most inspired him: the nude or lightly clad figure in motion. In the process he could model the forms of the body in full sunlight, and create images of deep space utilizing his studies in perspective. No less important in Eakins' life was his work as a teacher. As an instructor he was a highly influential presence in American art. The difficulties which beset him as an artist seeking to paint the portrait and figure realistically were paralleled and even amplified in his career as an educator, where behavioral and sexual scandals truncated his success and damaged his reputation. Eakins also took a keen interest in the new technologies of motion photography, a field in which he is now seen as an innovator. Eakins was a controversial figure whose work received little by way of official recognition during his lifetime. Since his death, he has been celebrated by American art historians as "the strongest, most profound realist in nineteenth and early twentieth century American art".

Eakins was born and lived most of his life in Philadelphia. He was the first child of Caroline Cowperthwait Eakins, a woman of English and Dutch descent, and Benjamin Eakins, a writing master and calligraphy teacher of Scots-Irish ancestry. Benjamin Eakins grew up on a farm in Valley Forge, Pennsylvania, the son of a weaver. He was successful in his chosen profession, and moved to Philadelphia in the early 1840s to raise his family. Thomas Eakins observed his father at work and by twelve demonstrated skill in precise line drawing, perspective, and the use of a grid to lay out a careful design, skills he later applied to his art. He was an athletic child who enjoyed rowing, ice skating, swimming, wrestling, sailing, and gymnastics — activities he later painted and encouraged in his students. Eakins attended Central High School, the premier public school for applied science and arts in the city, where he excelled in mechanical drawing. He studied drawing and anatomy at the Pennsylvania Academy of the Fine Arts beginning in 1861, and attended courses in anatomy and dissection at Jefferson Medical College from 1864-65. For a while, he followed his father's profession and was listed in city directories as a "writing teacher". His scientific interest in the human body led him to consider becoming a surgeon. Eakins then studied art in Europe from 1866 to 1870, notably in Paris with Jean-Léon Gérôme, being only the second American pupil of the French realist painter famous as a master of Orientalism. He also attended the atelier of Léon Bonnat, a realist painter who emphasized anatomical preciseness, a method adapted by Eakins. While studying at L'Ecole des Beaux-Arts, he seems to have taken scant interest in the new Impressionist movement, nor was he impressed by what he perceived as the classical pretensions of the French Academy. Already at age 24, "Nudity and verity were linked with an unusual closeness in his mind." Yet his desire for truthfulness was more expansive, and the letters home to Philadelphia reveal a passion for realism that included, but was not limited to, the study of the figure.

A trip to Spain for six months confirmed his admiration for the realism of artists such as Diego Velazquez and Jusepe de Ribera. In Seville in 1870 he painted Carmelita Requeña, a portrait of a seven year old gypsy dancer more freely and colorfully painted than his Paris studies. That same year he attempted his first large oil painting, A Street Scene in Seville, wherein he first dealt with the complications of a scene observed outside the studio. Although he failed to matriculate and showed no works in the salons, Eakins succeeded in absorbing the techniques and methods of French and Spanish masters, and he began to formulate his artistic vision which he demonstrated in his first major painting upon his return to America. "I shall seek to achieve my broad effect from the very beginning," he declared. Eakins's first works upon his return from Europe included a large group of rowing scenes, eleven oils and watercolors in all, of which the first and most famous is Max Schmitt in a Single Scull (1871; also known as The Champion Single Sculling). Both his subject and his technique drew attention. His selection of a contemporary sport was “a shock to the artistic conventionalities of the city”. Eakins placed himself in the painting, in a scull behind Schmitt, his name inscribed on the boat. Typically, the work entailed critical observation of the painting's subject, as well as preparatory drawings of the figure and perspective plans of the scull in the water. Its preparation and composition indicates the importance of Eakins' academic training in Paris. It was a completely original conception, true to Eakins' firsthand experience, and an almost startlingly successful image for the artist, who had struggled with his first outdoor composition less than a year before. His first known sale was the watercolor ‘’The Sculler’’ (1874). Most critics judged the rowing pictures successful and auspicious, but after the initial flourish, Eakins never revisited the subject of rowing and went on to other sports themes.

At the same time that he made these initial ventures into outdoor themes, Eakins produced a series of domestic Victorian interiors, often with his father, his sisters or friends as the subjects. ‘’Home Scene’’ (1871), ‘’Elizabeth at the Piano’’ (1875), ‘’The Chess Players’’ (1876) , and ’’Elizabeth Crowell and her Dog’’ (1874), each dark in tonality, focus on the unsentimental characterization of individuals adopting natural attitudes in their homes. It was in this vein that in 1872 he painted his first large scale portrait, ‘’Kathrin’’, in which the subject, Kathrin Crowell, is seen in dim light, playing with a kitten. In 1874 Eakins and Crowell became engaged; they were still engaged five years later, when Crowell died of meningitis in 1879.

He returned to the Pennsylvania Academy to teach in 1876 as a volunteer after the opening of the school’s new Frank Furness designed building, became a salaried professor in 1878, and rose to director in 1882. His teaching methods were controversial: there was no drawing from antique casts, and students received only a short study in charcoal, followed quickly by their introduction to painting, in order to grasp subjects in true color as soon as practical. He encouraged students to use photography as an aid to anatomy and the study of motion, and disallowed prize competitions. Although there was no specialized vocational instruction, students with aspirations for using their school training for applied arts, such as illustration, lithography, and decoration, were as welcome as students interested in becoming portrait artists. Most notable was his interest in the instruction of all aspects of the human figure, including anatomical study of the human and animal body and surgical dissection; there were also rigorous courses in the fundamentals of form, and studies in perspective which involved mathematics. As an aid to the study of anatomy, plaster casts were made from dissections, duplicates of which were furnished to students. A similar study was made of the anatomy of horses; acknowledging Eakins' expertise, in 1891 his friend the sculptor William Rudolf O'Donovan asked him to collaborate on the commission to create bronze equestrian reliefs of Abraham Lincoln and Ulysses S. Grant for the Soldiers' and Sailors' Memorial Arch in Grand Army Plaza In Brooklyn.

Owing to Eakins' devotion to working from life, the Academy's course of study was by the early 1880s the most "liberal and advanced in the world". Eakins believed in teaching by example and letting the students find their own way with only terse guidance. He stated his teaching philosophy bluntly, “A teacher can do very little for a pupil & should only be thankful if he don’t hinder him ... and the greater the master, mostly the less he can say.” He believed that women should "assume professional privileges" as would men. Life classes and dissection were segregated but women had access to male models (who were nude but for loincloths). The line between impartiality and questionable behavior was a thin one. When a female student, Amelia Van Buren, asked about the movement of the pelvis, Eakins invited her to his studio, where he undressed and "gave her the explanation as I could not have done by words only". Such incidents, coupled with the ambitions of his younger associates to oust him and take over the school themselves, created tensions between him and the Academy's board of directors. He was ultimately forced to resign in 1886, for removing the loincloth of a male model in a class where female students were present. His poor judgment and provocative, disdainful behavior didn’t help matters either. Eakins took the dismissal hard. His family was split, with his in-laws siding against him in public dispute. He struggled to protect his name against rumors and false charges, had bouts of ill health, and suffered a humiliation which he felt for the rest of his life. Eakins' popularity amongst the students was such that a number of them broke with the Academy and formed the Art Students' League of Philadelphia, where Eakins subsequently instructed. It was there that he met the student, Samuel Murray, who would become his protege and life-long friend. He also lectured and taught at a number of other schools, including the Art Students League of New York, the National Academy of Design, Cooper Union, and the Art Students' Guild in Washington, D.C., until he withdrew from teaching by 1898.

Eakins has been credited with having "introduced the camera to the American art studio". During his study abroad, he was exposed to the use of photography by the French realists, though the use of photography was still frowned upon as a shortcut by traditionalists. In the late 1870s he was introduced to the photographic motion studies of Eadweard Muybridge, particularly the equine studies, and became interested in using the camera to study sequential movement. He performed his own motion studies, usually involving the nude figure, and even developed his own technique for capturing movement on film. Where Muybridge's system relied on a series of cameras triggered to produce a sequence of individual photographs, Eakins preferred to use a single camera to produce a series of exposures on one negative. An excellent example is his painting A May Morning in the Park, which relied heavily on these motion studies to depict the true gait of the four horses pulling the coach of patron Fairman Rogers. But in typical fashion Eakins also employed wax figures and oil sketches to get the final effect he desired.

After Eakins obtained a camera in 1880, several paintings, such as Mending the Net (1881) and Arcadia (1883), are known to have been derived at least in part from his photographs. Some figures appear to be detailed transcriptions and tracings from the photographs by some device like a magic lantern, which Eakins took pains to cover up with oil paint. Eakins' methods appear to be meticulously applied, and rather than shortcuts, were likely used in a quest for accuracy and realism. The so-called “Naked Series”, which began in 1883, were nude photos of students and professional models which were taken to show real human anatomy from several specific angles, and were often hung up and displayed for study at the school. Later, less regimented poses were taken indoors and out, of men, women, and children, including his wife. The most provocative, and the only ones combining males and females, were nude photos of Eakins and a female model. Although witnesses and chaparones were usually on site, and the poses were mostly traditional in nature, the sheer quantity of the photos and Eakins’ overt display of them may have undermined his standing at the Academy. In all, about eight hundred photographs are now attributed to Eakins and his circle, most of which are figure studies, both clothed and nude, and portraits. No other American artist of his time matched Eakins' interest in photography, nor produced a comparable body of photographic works.

For Eakins, portraiture held little interest as a means of fashionable idealization or even simple verisimilitude — it provided the opportunity to reveal the character of an individual through the modeling of solid anatomical form. This meant that, notwithstanding his youthful optimism, he would never be a commercially successful portrait painter. Few commissions came his way. But his total output of some two hundred and fifty portraits is characterized by "an uncompromising search for the unique human being". Often this search for individuality required that the subject be painted in their working environment. His Portrait of Professor Benjamin H. Rand (1874) was a prelude to what many consider his most important work. In The Gross Clinic (1875), a renowned Philadelphia surgeon, Dr. Samuel D. Gross, is seen presiding over an operation to remove part of a diseased bone from a patient's thigh. Gross lectures in an amphitheater crowded with students at Jefferson Medical College. Eakins spent nearly a year on the painting, again choosing a novel subject, the discipline of modern surgery, in which Philadelphia was in the forefront. He initiated the project and may have had the goal of a grand work befitting a showing at the Centennial Exposition of 1876. Though rejected for the Art Gallery, the painting was shown on the centennial grounds at an exhibit of a U.S. Army Post Hospital. In sharp contrast, The Chess Players was accepted by the Committee and was much admired at the Centennial Exhibition, and critically praised. At 96 by 78 inches, it is one of the artist's largest works, and considered by some to be his greatest. Eakins was elated by the project and stated that “it is very far better than anything I have ever done”. But if Eakins hoped to impress his home town with the picture, he was to be disappointed; public reaction to the painting of a realistic surgical incision and the resultant blood was ambivalent at best, and it was finally purchased by the college for the unimpressive sum of $200. Eakins borrowed it for subsequent exhibitions, where it drew strong reactions, such as that of the New York Daily Tribune, which both acknowledged and damned its powerful image.

In 1876, Eakins completed a portrait of Dr. John Brinton, surgeon of the Philadelphia Hospital, and famed for his Civil War service. Done in a ‘dignified’, more informal setting than the Gross Clinic, it was a personal favorite of Eakins, and The Art Journal proclaimed “it is in every respect a more favorable example of this artist’s abilities than his much-talked-of composition representing a dissecting room.”  Other outstanding examples of his portraits include The Agnew Clinic (1889), Eakins' most important commission and largest painting, which depicted another eminent American surgeon, Dr. David Hayes Agnew, performing a mastectomy; The Dean's Roll Call (1899), featuring Dr. James W. Holland, and Professor Leslie W. Miller (1901), portraits of educators standing as if addressing an audience; Frank Hamilton Cushing (ca. 1895), in which the prominent ethnologist is seen performing an incantation in a Zuñi pueblo; Professor Henry A. Rowland (1897), a brilliant scientist whose study of spectroscopy revolutionized his field; Antiquated Music (1900), in which Mrs. William D. Frishmuth is shown seated amidst her collection of musical instruments; and The Concert Singer (1890-92), for which Eakins asked Weda Cook to sing "O rest in the Lord", so that he could study the muscles of her throat and mouth. In order to replicate the proper deployment of a baton, Eakins enlisted an orchestra conductor to pose for the hand seen in the lower left-hand corner of the painting.

Of Eakins' later portraits, many took as their subjects women who were friends or students. Unlike most portrayals of women at the time, they are devoid of glamor and idealization. For Portrait of Letitia Wilson Jordan (1888), Eakins painted the sitter wearing the same evening dress in which he had seen her at a party. She is a substantial presence, a vision quite different from the era's fashionable portraiture. So, too, his portrait of Maud Cook (1895), where the obvious beauty of the subject is noted with "a stark objectivity". The portrait of Miss Amelia C. Van Buren (ca. 1890), a friend and former pupil, suggests the melancholy of a complex personality, and has been called "the finest of all American portraits". Even Susan Macdowell Eakins, a strong painter and former student who married Eakins in 1884, was not sentimentalized: despite its richness of color, The Artist's Wife and His Setter Dog (ca. 1884-89) is a penetratingly candid portrait. Some of his most vivid portraits resulted from a late series done for the Catholic clergy, which included paintings of a cardinal, archbishops, bishops, and monsignors. As usual, most of the sitters were engaged at Eakins' request, and were given the portraits when Eakins had completed them. In portraits of His Eminence Sebastiano Cardinal Martinelli (1902), Archbishop William Henry Elder (1903), and Monsignor James P. Turner (ca. 1906), Eakins took advantage of the brilliant vestments of the offices to animate the compositions in a way not possible in his other male portraits.

Deeply affected by his dismissal from the Academy, Eakins's later career focused on portraiture. His steadfast insistence on his own vision of realism, in addition to his notoriety from his school scandals, combined to hurt his income in later years. Even as he approached these portraits with the skill of a highly trained anatomist, what is most noteworthy is the intense psychological presence of his sitters. However, it was precisely for this reason that his portraits were often rejected by the sitters or their families. As a result, Eakins came to rely on his friends and family members to model for portraits. His portrait of Walt Whitman (1887-1888) was the poet's favorite.

Eakins' lifelong interest in the figure, nude or nearly so, took several thematic forms. The rowing paintings of the early 1870s constitute the first series of figure studies. In Eakins' largest picture on the subject, The Biglin Brothers Turning the Stake (1873), the muscular dynamism of the body is given its fullest treatment. In 1877 he painted the female nude as integral to a historical subject, William Rush and His Model, even though there is no evidence that the model who posed for Rush did so in the nude. The Centennial Exhibition of 1876 helped foster a revival in interest in Colonial America and Eakins participated with an ambitious project employing oil studies, wax and wood models, and finally the portrait in 1877. William Rush was a celebrated Colonial sculptor and ship carver, a revered example of an artist-citizen who figured prominently in Philadelphia civic life, and a founder of the Pennsylvania Academy of Fine Arts where Eakins had started teaching. Despite his sincerely depicted reverence for Rush, Eakins' treatment of the human body once again drew criticism. This time it was the nude model and her heaped-up clothes depicted front and center, with Rush relegated to the deep shadows in the left background, that stirred dissatisfaction. Nonetheless, Eakins found a subject which referenced his native city, an earlier Philadelphia artist, and allowed for an assay on the female nude seen from behind. When he returned to the subject many years later, the narrative became more personal: In William Rush and His Model (1908), gone are the chaperon and detailed interior of the earlier work. The professional distance between sculptor and model has been eliminated, and the relationship has become intimate. The nude is seen from the front, being helped down from the model stand by an artist who bears a strong resemblance to Eakins. The Swimming Hole (1884-5) features Eakins' finest studies of the nude, in his most successfully constructed outdoor picture. The figures are those of his friends and students, and include a self-portrait. Although there are photographs by Eakins which relate to the painting, the picture's powerful pyramidal composition and sculptural conception of the individual bodies are completely distinctive pictorial resolutions. The work was painted on commission, but was refused. In the late 1890s Eakins returned to the male figure, this time in a more urban setting. Taking the Count (1896), a painting of a prizefight, was his second largest canvas, but not his most successful composition. The same may be said of Wrestlers (1899). More successful was Between Rounds (1899), for which boxer Billy Smith posed seated in his corner at Philadelphia's Arena; in fact, all the principles were posed for by models re-enacting their roles in what had been an actual fight. Salutat (1898), a frieze-like composition in which the main figure is isolated, "is one of Eakins' finest achievements in figure-painting." In his later years Eakins persistently asked his female portrait models to pose in the nude, a practice which would have been all but prohibited in conventional Philadelphia society. Inevitably, his desires were frustrated.

Eakins married Susan Hannah MacDowell, one of his students at the Academy, in 1884. She was the fifth of eight children of a Philadelphia engraver, well known in the artistic community. She was 25 when Eakins met her at the Hazeltine Gallery where "The Gross Clinic" was being exhibited in 1875. Unlike many, she was impressed by the controversial painting and she decided to study with him at the Academy, which she attended for 6 years, adopting a sober, realistic style similar to her teacher’s. She was an outstanding student and winner of the Mary Smith prize for the best painting by a matriculating woman artist. After their childless marriage, she only painted sporadically and spent most of her time supporting her husband’s career, entertaining guests and students, and faithfully backing him in his difficult times with the Academy, even when some members of her family aligned against Eakins. She and Eakins both shared a passion for photography, both as photographers and subjects, and employed it as a tool for their art. She also posed nude for many of his photos and took images of him. Both had separate studios in their home. After his death in 1916, she returned to painting, adding considerably to her output right up to the 1930s, in a style that became warmer, looser, and brighter in tone. She died in 1938. Thirty-five years after her death, in 1973, she had her first one-woman exhibition at the Pennsylvania Academy of Fine Arts.