Mac has collaborated with these illustrators:

Isabelle Arsenault
Kate Berube
Jen Corace
Kevin Cornell
Marla Frazee
Shawn Harris
Sarah Jacoby
Claire Keane
Jon Klassen
Renata Liwska
Mike Lowery
Patrick McDonnell
Matthew Myers
Elise Parsley
Greg Pizzoli
Adam Rex
Christian Robinson
Dan Santat
Scott Teplin
Chris Van Dusen

AND:

TED Talk: "Why a good book is a secret door"
The Picture Book Proclamation
The Brixton Brothers
The Echo Park Time Travel Mart
The Terrible Two
Sarah Jacoby’s Margaret Wise Brown Research Blog