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8/5/11 Oakland Athletics assigned P J.J. Leaper to Advanced-A Stockton (California).
8/4/11 Oakland Athletics signed P J.J. Leaper.
7/5/10 Kansas City Royals assigned P J.J. Leaper to Rookie Burlington (Appalachian).
7/4/10 Kansas City Royals signed P J.J. Leaper.

Sam Miller is the editor-in-chief of Baseball Prospectus. He has written for two Baseball Prospectus annuals and co-edited the 2014, 2015 and 2016 editions. He also co-hosts, with Ben Lindbergh, the Effectively Wild podcast, and is the co-author of The Only Rule Is It Has To Work, about his experience running baseball operations for an independent minor-league team.