Starting out in the late 1960s as an underground comix distributor, in the early 1970s, he published comics, and by the mid-1970s he had become a New York City art dealer.
[1] He published comics during 1971–1977, with the bulk coming in 1975–1976, under such names as Keith Green / Industrial Realities and the imprint Saving Grace.
Around 1971, he produced the fourth through eighth printings of Robert Crumb's Big Ass Comics, originally published by Rip Off Press in 1969.
[3] Around the same time, Green reprinted Robert Williams' Coochy Cooty Men's Comics, originally published by the Print Mint in 1970.
[6] The bulk of Green's publishing output was in 1975–1976, when he produced original comics by S. Clay Wilson, Jim Osborne, Willy Murphy, Ted Richards, Jerry Lane, and Spain Rodriguez.