Jack "Sid" Siedlecki (pronounced /sɪdˈlɛki/ sid-LEK-ee; born July 23, 1951) is an American former college football coach.

Siedleck's high school basketball coach later recalled that Siedlecki was not a good shooter, but had great vision as the team's point guard: "He could see things unfold before they happened.

"[2]He next attended Union College in Schenectady, New York, where he received a Bachelor of Arts degree in history in 1974.

"[3] He recalled that the assistants at Albany earned $2,500 to $3,000 a year, and five coaches shared one house for which they paid $225 per month in rent.

To support himself, Siedlecki also taught at a local Catholic elementary school, worked as a building supervisor three nights a week and coached junior varsity baseball.

[1] In January 1988, Siedlecki was hired as the head football coach at Worcester Polytechnic Institute.

[1] The 1992 team also made the school's first appearance in the NCAA Division III playoffs and won the inaugural title of the Freedom Football Conference.

Mills, later recalled the first practice at Amherst:"Two of the players came over the hill and down onto the field about five seconds after the rest of the team had lined up.

"[9]The New York Times reported that "Siedlecki performed miracles at Amherst," turning a program that had won one game in three years into a consistent winner.

[8] In four seasons as the head coach of the Amherst Lord Jeffs, Siedlecki compiled a 20–11–1 record.

His 1996 team finished with a 7–1 record and won the New England Small College Athletic Conference championship.

"[8] At the news conference announcing his hiring, Siedlecki responded to questions suggesting he had been a second choice to Dick Jauron:"Whenever jobs like this open, very good people get involved.

"[9]In his first three years as Yale's head coach, Siedlecki turned the program around from a 1–9 record in 1997 to 9–1 and a share of the Ivy League championship in 1999.

Siedlecki was named the New England Sports Writer's 1999 Coach of the Year for leading the school's turnaround in football.

[1] In 2006, he led Yale to a share of the Ivy League championship after finishing 8–2 (6–1 in conference games); the 2006 team defeated Harvard by a score of 34–13.

[1] In 2007, he led Yale to a 9–1 record and was named 2007 New England Coach of the Year by sports writers.

[1] At the end of November 2008, less than a week after a 10–0 loss against Harvard and a 6–4 season record, and amid criticism from students and alumni, Siedlecki announced his retirement from coaching after 12 years at Yale.

In the summer of 2010, Siedlecki decided to come out of retirement to become the offensive coordinator and quarterbacks coach at Wesleyan University.