Career
He was born in Germany and became a barrister by career. Jaenicke was an unsuccessful 1938 provincial election candidate for the Saskatchewan Company-operative Commonwealth Federation in the constituency of Kerrobert-Kindersley. He was first elected to Parliament from the Kindersley riding in the 1945 general election.
Jaenicke was defeated in the 1949 election by Fred Larson of the Liberal party.