It's easy to forget that Harlequin started life as a Winnipeg company. The editorial office was in Toronto (on Carlton Street just down the street from Maple Leaf Gardens) but everything else was in Winnipeg. Most artists were based in Toronto but two Winnipeg artists did one cover each in 1957.
There is a bit on the web about Bernie Michaleski (? - ?) but nothing very much about Manly Geller (? - 1987).