Robert J. Seiwald (born March 26, 1925) is an American retired chemist.
Prior to enlisting in the United States Army during World War II in 1944, he enrolled at the University of San Francisco, where he majored in chemistry.
[1] In 1960, Seiwald and Joseph H. Burckhalter received a patent while working at University of Kansas, for their work on fluorescein fluorescein isothiocyanate and rhodamine isothiocyanate, the former being an antibody labeling agent which helps accurately diagnosing various diseases.
In 1957, he returned to the University of San Francisco as an organic chemistry professor, a position he held until his retirement in 1999.
In 1995, Seiwald and Burckhalter were inducted into the National Inventors Hall of Fame.