Clearly, the most underrated offensive lineman in the Ivy League after starting 18 of the last 20 games. He’s bright, athletic and makes all of the calls for the offensive line…Junior: Took every snap at center for Brown’s Ivy Championship team…Helped lead the Bears’ offense to a number one rank in the Ivy League in total sacks against with just 7 on the season… Sophomore: Arguably the most improved offensive lineman, who won the starting center job and earned starts in eight games… Freshman: Earned valuable experience on Brown’s Junior Varsity team… Secondary School Background: A graduate of the Christian Brothers Academy where he lettered in football… Two-time All-League… First Team All-Central New York… Third Team All-New York State… Recipient of the Tom Wadanole Team Player Award… Selected to play in New York-New Jersey Governor’s Bowl at West Point… Helped lead his team to the 2004 New York State Class AA Championship… Member of the National Honor Society… Three-time class president… Who’s Who Among American High School Students… Four-time member of the Honor Roll… Personal: Mark Francis Callahan, born October 26, 1987… Son of John and Patricia Callahan… Has a brother, Jeff, and a sister, Amy… Enjoys Olympic weightlifting, college basketball and music… Concentrating in Commerce, Organizations, and Entrepreneurship and Business Economics.