Thomas was drafted by the Los Angeles Rams in the 2nd round (39th overall) of the 1976 NFL Draft. He played in the NFL for the Los Angeles Rams from 1976 to 1982. He was twice named an All-Pro selection, in 1978 and 1980.
Thomas started coaching at St. Joseph's Collegiate Institute in Buffalo New York in 2006. One student of specific note to Thomas was Naaman Roosevelt, who went on to break the record for most touchdown passes in a single season in western New York, and to play receiver at the University of Buffalo. Father of Heather McCarthy, Patrick Thomas,Jr.,MDPhd,Tamara Thomas and Joshua Thomas.