 A freelancer, Janke worked for both DC and Marvel Comics during his career, penciling covers and stories here and there, but mostly focusing on "finish inking" over other artists' pencils.Janke has worked extensively with pencilers Jon Bogdanove and Jerry Ordway, and is a co-creator (with artist Ordway) of Bertron (who created Doomsday), and Mr. Z (best known from the "Superman" story "Time and Time Again").With Mark Gruenwald and Paul Neary, Janke co-created Armadillo.