Disambiguation: Parasite
First published in: 1966
First appearance of Maxwell Jensen during the Pre-Crisis Earth One era was in Action Comics (DC, 1938 series) #340 (August 1966). His last Pre-Crisis appearance was in Action Comics (DC, 1938 series) #578 (April 1986). Erased during Crisis on Infinite Earths, he has been revived as a result of Dark Crisis on Infinite Earths. Maxwell Jensen was created by Jim Shooter.
Link: https://en.wikipedia.org/wiki/Parasite_(comics)#Raymond_Jensen