Zachary Weinersmith (born Zachary Alexander Weiner) is an American cartoonist, who is best known for his webcomic Saturday Morning Breakfast Cereal (SMBC). He is the author of two other webcomics, the completed Captain Stupendous with artist Chris Jones, and Snowflakes, co‐​written by James Ashby and also illustrated by Chris Jones. He also founded the sketch comedy group SMBC Theater with James Ashby and Marty Weiner in 2009. He is also the illustrator of Open Borders: The Science and Ethics of Immigration.