Birtwell, a 2001 Harvard graduate and one of the program's fiercest competitors, is in his second stint on the Crimson bench and fourth season overall as a member of the coaching staff in 2013. Birtwell was a two-time All-Ivy League selection and 1999 Ivy League Pitcher of the Year.
Birtwell coached with the program in 2009 and returned in 2011 after spending a year as a pitching coach for the Florida Marlins A-affiliate Jamestown Jammers and another year as a writer at ESPN covering the Cape Cod Baseball League.
After graduating from Harvard, Birtwell played eight professional seasons with three organizations, reaching the AAA with the Oakland A's affiliate Sacramento River Cats in 2006.
In 2002, Birtwell was a Midwest League all-star for the Detroit Tigers' A-affiliate West Michigan Whitecaps. Later that year he was named as the Detroit Tigers Organization Minor League Pitcher of the Year. In his professional career, he recorded 384 strikeouts in 349 innings with a 2.97 ERA.
He resides in Boston with his wife, Loula.