A member of the Democratic Farmer Labor Party, he represented District 59A, which includes a portion of Hennepin in the northwestern Twin Cities metropolitan area.
Biernat served in the United States Army.
Biernat served four terms in the House of Representatives: 80th, 81st, 82nd, and 83rd.
[1] He is Emeritus Professor of Law at Mitchell Hamline School of Law Biernat's father Thaddeus Lewis Biernat served in the Minnesota Legislature a decade prior to Biernat's first term.
He is retired and lives in Bonita Springs Florida.