Mort Weisinger's Johnny Quick, probably the first strip he conceived for Detective Comics upon moving over from Standard's pulp magazine line, debuted in More Fun 71, September 1941.  Chad Grothkopf is the most likely artist for the first two or three appearances, although doubt remains.
With number 74, Batman artist Jerry Robinson took over for two issues.
After that Mort Meskin settle in for a long run, usually signing his stories Mort Morton Jr.  This is from More Fun 76, featuring Dr. Clever once again.

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