Career
He represented Coquitlam in the Legislative Assembly of British Columbia from 1975 to 1979 as a Social Cr member. He was born in Lafleche, Saskatchewan, the son of Gustave A. Kerster and Marjorie P. Gohn, and was educated in Fort William, Ontario, in North Battleford, Saskatchewan andin Weyburn, Saskatchewan. Kerster was a 1st lieutenant in the Regina militia.
He later moved to Coquitlam, British Columbia.
He was defeated by Norman Levi in 1979 when he ran for reelection in the new riding of Coquitlam-Maillardville. In 2001, Kerster was convicted of trying to buy sex from a minor.