Get Smart was all the result of this man -it was he who wanted to spoof Bond and UNCLE. Thus all the Melnick references in GS: Melnick Uranium Mines, Melnick the Smiling Killer, & Put a Red in Your Bed Melnick.
He was creator of all those doors Max had to walk through as well a Get Smart producer. Kids know his name better from the Mad Libs books.
Susskind was the father of Talent Associates, founding it all the way back in 1948. He is more famous for his sometimes controversial talk show Open End. Susskind died in 1987.