it sounds like Thomas Sewall (1786-1845, M.D., Harvard, 1812). He practiced medicine in Essex County, Mass., to 1819 and became a professor of medicine at Columbian College (now George Washington Univ.) in 1821. There was a conviction in 1819 resulting from his treatment of deceased patients' bodies. One would have to see the article to be sure.
This Thomas Sewall was descended from John Sewall, a younger brother of Judge Samuel Sewall.