Ackerman was an early member of the Los Angeles Chapter of the Science Fiction League and became so active in and important to the club that in essence he ran it, including (after the name change) the Los Angeles Science Fantasy Society, a prominent regional fan organization, as well as the National Fantasy Fan Federation (N3F). Together with Morojo, he edited and produced "Imagination!", later renamed "Voice of the Imagi-Nation" (which in 1996 would be awarded the Retro Hugo for Best Fanzine of 1946, and in 2014 for 1939), which was nominally the club fanzine for the LASFS.