Born in Stralsund, Zegelmaker is of Curaçaoan ancestry and was ordained to the priesthood in Kiel on May 16 1973. On April 16, 1999, he was appointed Auxiliary Bishop of Kiel and Titular Bishop of Einthissen. Zegelmaker received his episcopal consecration on the following May 24 from Bishop Alfons Spielmeyer, with Bishops Hans Thomassen and Friedrich Mandel serving as co-consecrators.