1. He is known for his role as Jim Halpert on the NBC sitcom The Office.
2. Krasinski was born in Newton, Massachusetts, to Mary Clare , a nurse, and Ronald Krasinski, an internist. His father is Polish-American and his mother is Irish-American.
3. He has two older brothers, Kevin and Paul, and was raised Roman Catholic.
4. Krasinski made his stage debut as Daddy Warbucks in a sixth-grade school production of Annie.
5. Afterwards, he co-starred in a satirical play written and cast by his future The Office co-star B.J. Novak when they were high school seniors.
6. Krasinski and Novak both graduated from Newton South High School in 1997.
7. Before entering college, Krasinski taught English as a foreign language in Costa Rica. In college, he also helped coach youth basketball at The Gordon School in East Providence, Rhode Island.
8. Besides training at the National Theater Institute, he also studied at The Royal Shakespeare Company in Stratford-upon-Avon, England, and The Actors Center in New York City.
9. After graduating from Brown University, Krasinski went to New York City to pursue acting, appearing in commercials and guest-starring on television shows, as well as doing readings of off-Broadway plays while working as a waiter.
10. He also starred as Brevin in the Gregg Araki film Smiley Face, filmed in 2006.
11. Afterwards, he co-starred in films including License to Wed, with Mandy Moore and Robin Williams, and Leatherheads with George Clooney and Renée Zellweger.
12. Krasinski co-starred in Away We Go with Maya Rudolph, directed by Sam Mendes that filmed from April to June 2008.
13. It premiered at the 2009 Sundance Film Festival. and CSI: Crime Scene Investigation.
14. He also co-starred in films including Kinsey, Duane Hopwood, Jarhead, The Holiday and Shrek the Third.
15. Krasinski co-starred as Ethan in a film adaptation of the novel Something Borrowed.
16. Beginning in March 2006, Krasinski narrated a series of commercials for Ask.com.
17. In April 2011, he co-starred in a New Era/Major League Baseball ad campaign with Alec Baldwin, playing off the rivalry between the Boston Red Sox and New York Yankees.