Thomas Dale Stewart was an American chemist.

He was born at Sumner, Washington

Sumner, Washington

Sumner is a city in northern Pierce County, Washington, United States. The population was 9,451 at the 2010 census. Nearby cities include Puyallup to the west, Auburn to the north, and Enumclaw to the east.-History:...

, and received his Ph.D.

Ph.D.

A Ph.D. is a Doctor of Philosophy, an academic degree.Ph.D. may also refer to:* Ph.D. , a 1980s British group*Piled Higher and Deeper, a web comic strip*PhD: Phantasy Degree, a Korean comic series* PhD Docbook renderer, an XML renderer...

 degree in chemistry from University of California at Berkeley in 1916. After one year of research at University of Chicago

University of Chicago

The University of Chicago is a private research university in Chicago, Illinois, USA. It was founded by the American Baptist Education Society with a donation from oil magnate and philanthropist John D. Rockefeller and incorporated in 1890...

 under Julius Stieglitz, he returned to Berkeley as an instructor in the chemistry department, and became a professor there in 1935.

His early research was about the mechanism of electron conduction in metals. The collaborative work with Richard C. Tolman

Richard C. Tolman

Richard Chace Tolman was an American mathematical physicist and physical chemist who was an authority on statistical mechanics. He also made important contributions to theoretical cosmology in the years soon after Einstein's discovery of general relativity...

 lead to the discovery of Stewart-Tolman effect

Stewart-Tolman effect

The Stewart–Tolman effect is a phenomenon in electrodynamics caused by the finite mass of electrons in conducting metal, or, more generally, the finite mass of charge carriers in an electrical conductor....

. Later he worked on acid-base equilibria of organic nitrogen compounds, as well as reaction kinetics.