Vivien Theodore Thomas (August 29, 1910 – November 26, 1985)[1] was an African-American surgical technician who developed the procedures used to treat blue baby syndrome in the 1940s. He was the assistant to surgeon Alfred Blalock in Blalock's experimental animal laboratory at Vanderbilt University in Nashville, Tennessee, and later at the Johns Hopkins University in Baltimore, Maryland. He served as supervisor of the surgical laboratories at Johns Hopkins for 35 years.