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Mark Kelly was a captain in the United States Navy when he commanded the final mission of space shuttle Endeavour in May 2011. A veteran of four space flights to the International Space Station, he is a graduate of the United States Merchant Marine Academy and holds a master’s degree from the U.S. Naval Postgraduate School.

He is the author of Mousetronaut: Based on a (Partially) True Story, which will be published on Oct. 9 by Paula Wiseman Books, an imprint of Simon & Schuster Books for Young Readers.