Rocco Constantino has been a baseball writer for various outlets for over a decade. He currently is the co-founder and Lead Baseball Writer for BallNine.com, a baseball history multimedia website founded in 2020 with Editor-in-Chief Chris Vitali. Previously, Constantino wrote for Bleacher Report and Baseball Hot Corner.

In 2016, Constantino published his first book, 50 Moments That Defined Major League Baseball, which was named by Sports Collectors Digest as one of the Best Baseball Books of 2016. 50 Moments That Defined Major League Baseball was published through Rowman & LIttlefield. Constantino's second book, Beyond Baseball's Color Barrier, is due out in May of 2021 through Rowman & Littlefield as well. He is represented by P.S. Literary Agency.

In addition to working as a writer, Constantino also serves the Director of Athletics at Santa Barbara City College where he helms one of the largest and most successful two-year college Athletics Departments in the state of California. Constantino is a native of Belleville, New Jersey and currently lives in Montecito, California.