Here are some clues:
1. He painted in the late 19th century.
2. He was born in Philadelphia.
3. He taught at the Pennsylvania Academy of Fine Arts.
4. His wife Susan, a talented painter and photographer, was his former student.
5. His painting The Agnew Clinic was inspired by Rembrandt's painting The Anatomy of Dr. Tulp from 1632.
Answer: Thomas Eakins, The Artists's Wife and his Setter Dog, 1884-89