...with a look at some of his covers you might not have seen...from the Challengers of the Unknown, adventure heroes living on borrowed time, with pilot Ace Morgan, fighter Rocky Davis and acrobat Red Ryan taking a slight turn towards the supernatural, as science based member Prof Haley was replaced with mystic Corinna Stark, and the team even met Deadman!
Challengers Of The Unknown #67 and #68 (April-May and June-July, 1969)
Challengers Of The Unknown #70 and #72 (October-November 1969 and February-March, 1970)
Challengers Of The Unknown #74 and #81 (June-July, 1970 and June-July, 1977)
here), with Neal only inking #81 featuring Multi-Man over Michael Netzer's pencils. The two missing covers were by Joe Kubert and Nick Cardy, in case you are curious.
here, a touch of his Green Lantern here, his Tomahawk covers here and a little recent article on his passing here.