Mark Thomas DeRosa (born February 26, 1975 in Passaic, New Jersey) is a former professional baseball player who played for the Braves, Cubs, Indians, Cardinals, Giants, Nationals and Blue Jays. DeRosa primarily played third and second base, but started at every position other than center field, pitcher, and catcher. He currently works for MLB Network as a personality on MLB Central.

Mark graduated from the Wharton School of the University of Pennsylvania in the class of 1997 - he was also one of six Ivy Leaguers on major league rosters at the beginning of the 2009 season. He was drafted by the Atlanta Braves in the 7th round (212th overall) of the 1996 Major League Baseball draft. He made his MLB debut on September 2, 1998 as a shortstop.

On February 23, 2008, DeRosa was taken to a hospital after having trouble breathing and having a rapid heart beat. On February 28, he had a successful heart procedure at Northwestern Memorial Hospital to correct an irregular heartbeat. His heart procedure earned him the nickname of "the Pulse", which was also the name of his blog on www.cubs.com.

DeRosa received the John Cerutti Award after the 2013 season, presented annually by the Toronto chapter of the Baseball Writers' Association of America to the player who best represents the spirit of the late Blue Jays pitcher.

Despite having multiple wrist injuries/surgeries which impacted his play, Mark finished with a respectable .268 lifetime batting average and a solid .340 OBP. After retiring in 2013, DeRosa accepted a position as a studio analyst with the MLB Network. He has been the broadcast announcer for the video game franchise MLB: The Show since replacing Harold Reynolds in MLB The Show 18.

(excerpted from Baseball Almanac, BR Bullpen & Wikipedia)