Answer the following Q with stream of consciousness. Passage: Al Capone Does My Shirts is a historical fiction novel for young adults by author Gennifer Choldenko. In this story, Moose Flanagan and his family move from Santa Monica to Alcatraz Island. The move was caused by the father's new job positions as an electrician and as a guard in the well known Alcatraz prison. The book was named as a Newbery Honor selection and in 2007 it received the California Young Reader Medal. It has two sequels, Al Capone Shines My Shoes and Al Capone Does My Homework.

Question: Based on this passage, who is the author of al capone does my shirts?
The relevant information is: Al Capone Does My Shirts is a historical fiction novel for young adults by author Gennifer Choldenko. Therefore, the final answer is author Gennifer Choldenko.