Epstein became the youngest general manager (GM) in the history of MLB, when the Boston Red Sox hired him at the age of 28 on November 25, 2002. In 2004, the Red Sox won their first World Series championship in 86 years and won another championship in 2007.

On October 21, 2011, he resigned from his job in Boston to become President of Baseball Operations for the Chicago Cubs, who – in 2016 – won their first World Series championship in 108 years.

Epstein was born in New York City and raised in Brookline, Massachusetts. He attended Brookline High School (a 1991 graduate), and played baseball for the Brookline High School Warriors, but dreamed of working for the Red Sox.

As a front office executive, Epstein is a three-time World Series Champion, winning twice with the Red Sox (2004 and 2007) and once with the Cubs (2016).

In 2007, the United States Sports Academy named Epstein the recipient of its "Carl Maddox Sport Management Award."

In December 2008, Baseball America named Epstein its Baseball America Major League Executive of the Year.

In September 2009, Epstein was named Sporting News Executive of the Decade. At the same time, the Red Sox were named Sporting News Team of the Decade.

In December 2009, Sports Illustrated named him (A) MLB's Best General Manager of the Decade and (B) number 3 on its list of the Top 10 GMs/Executives of the Decade (in all sports).

In November 2016, Epstein was named the Sporting News Executive of the Year.

Also in November 2016, Epstein won the Esurance MLB Award for Best Executive.

In March 2017, Epstein was announced as Yale's Class Day Speaker. Fortune Magazine also ranked Epstein #1 in their 2017 list of the "World's Greatest Leaders".

In April 2017, Time Magazine named Epstein one of the world's 100 most influential people.

According to wikipedia