Jack Cust was a professional baseball player who played as a designated hitter and outfielder for various teams in Major League Baseball (MLB). He was born on January 16, 1979, in Flemington, New Jersey, and attended Immaculata High School in Somerville, New Jersey.

Cust was drafted by the Arizona Diamondbacks in the first round of the 1997 MLB draft. He made his MLB debut with the Diamondbacks in 2001 and played for them until 2003. He then played for the Colorado Rockies, Baltimore Orioles, Oakland Athletics, San Diego Padres, and Houston Astros.

Cust was known for his power-hitting ability, but he also had a high strikeout rate. He hit a career-high 33 home runs for the Athletics in 2008 and had a career batting average of .242. He was also known for his patience at the plate, drawing a high number of walks throughout his career.

Despite his power-hitting ability, Cust struggled defensively and was primarily used as a designated hitter. He played in the outfield occasionally but was not known for his defensive skills.

Cust's career came to an end in 2012 when he was released by the New York Yankees during spring training. He played in the minor leagues for a few more years but never made it back to the majors.

Overall, Cust had a solid career as a power hitter in the MLB. He hit 105 home runs and had 323 RBIs in his career. However, his high strikeout rate and defensive struggles limited his playing time and ultimately led to the end of his career.