Nope. Mark Cerny is the Mark Cerny of Sony. He was once the Mark Cerny of SEGA. (Sonic 2 Genesis) and that is ok.

Iwata was unlike anyone in the industry. His kindness and approach to everything were unique. He also saved Earthbound and single-handedly reprogrammed the entire game out of the goodness of his heart in order to save the game. Even as president is sometimes assisted in development. He always far above and beyond the call of duty that was required of him.

Fun fact: Mark Cerny is not a Sony employee.

Except that he is. He was officially employed by Sony Computer Entertainment in 2007. 

EDIT - Maybe Not? Rewatching his GameLab speech, it seemed like he was employed as a guest.