In the just-aired Adventure Time episode "Everything's Jake"
Billy West, who has worked with John DiMaggio (Jake) in Futurama, guest starred in this episode reproducing three of his iconic voices from that show: Fry (Goose), Zapp Braninigan (Mayor) and Professor Farnsworth (Dr. Erik Adamkinson).
Voice actress Tress MacNeille, best known for her numerous voice acting roles in the 1990s, guest voiced as Dr. Erik Adamkinson's mother using her signature MOM voice and as Urchin in the style of "Tinny Tim', both from Futurama.http://www.billywest.com/audio.html
All the different stuff West has done has surely brought him into contact with Strong and St. Germain.
Strong and DiMaggio worked together on numerous
DC comic-based cartoons such as Batman.