Robert Alan Tewksbury (born November 30, 1960) is an American former Major League Baseball pitcher and current Mental Skills Coordinator for the Chicago Cubs.

He played professionally for the New York Yankees, Chicago Cubs, St. Louis Cardinals, Texas Rangers, San Diego Padres and the Minnesota Twins.

He earned a spot in the Yankees' rotation in 1986 after pitching 20 straight scoreless innings in spring training.

[1] In his major league debut on April 11, 1986, he allowed two runs in 7+1⁄3 innings against the Milwaukee Brewers, was credited with the win in New York's 3–2 victory, and received a standing ovation from the fans at Yankee Stadium.

[7] After the game, team owner George Steinbrenner sent him a bottle of champagne, which the pitcher never opened and kept as a souvenir.

In December 1996, he signed with the Minnesota Twins and played for two years with the team,[8] but shoulder problems effectively ended his baseball career after that.

Due to the shoulder and arm problems he faced over the course of his playing career, Tewksbury became known as an excellent control pitcher.

[11] His injury problems marred his success from that point forward, with his best post-Cardinals year being in San Diego, where he helped the Padres capture the NL West division title.

"[18] After retiring, Tewksbury worked as a player development consultant for the Boston Red Sox and appeared as a commentator for Red Sox coverage on the New England Sports Network[19] He earned his Bachelor of Science degree in physical education at St. Leo University in 2000 and earned his master's degree in psychology at Boston University in 2004.