Neal Adams and Mike Grell, seated together at a 1977 convention.

I worshipped Grell back in the day, starting with his SUPERBOY/LEGION run in 1974-1977, then his GREEN LANTERN run from 1976-1978, and ultimately his WARLORD run beginning in 1975 with FIRST ISSUE SPECIAL 8 and continuing in WARLORD 1-50 (1976-1982).

Grell must have been in heaven to meet Neal Adams, since Adams' GREEN LANTERN run from 1970-1972 is what first inspired Grell to become an artist.
And all the more ecstatic Grell must have been, to take over doing the art on GREEN LANTERN himself, alongside Dennis O'Neil, taking over the series that inspired him to enter comics in the first place!