Robert (Bob) W. Thomason (5 Nov 1952-Nov 1995) was an American mathematician. Towards the end of his short life, he worked in Max Karoubi’s lab. at Paris VII. His main contributions were in homotopy theory, algebraic geometry and algebraic K-theory, where he carefully used advanced categorical methods. His biography is to be found at
R. W. Thomason, Thomas Trobaugh, Higher algebraic K-theory of schemes and of derived categories, The Grothendieck Festschrift, 1990, 247-435.
A CatLab entry is here