Gregory Scott Booker (June 22, 1960 – March 30, 2019) was a professional baseball pitcher.
He pitched in all or part of eight seasons in Major League Baseball, from 1983 until 1990.
He also served as a coach for the San Diego Padres from 1997 until 2003, the first four years as bullpen coach, then a season-plus as pitching coach.
He was a scout for the Los Angeles Dodgers.Booker's wife, Kristi, was the daughter of long-time major league manager Jack McKeon and his son Zach was a catcher in the minor leagues from 2007 until 2011.On June 29, 1989, McKeon, often called "Trader Jack", traded his own son-in-law to the Minnesota Twins for pitcher Freddie Toliver.He died of melanoma on March 30, 2019.