Little sample about this guy via wikapedia. Guy worked w/Kosar in college and the pro's, and Kosar had his best years. He's also worked w/pro qb prospects as they call on him for help w/their pro day. He's worked w/Jay Cutler and Jason Campbell in that capacity.
NCAA He entered football coaching at the University of Miami
as a volunteer coach. In 1983 he was named quarterbacks coach
. That year quarterback Bernie Kosar
passed for 2,329 yards and Miami won the national championship. The next year Kosar completed 262 passes for 3,642 yards, both school records.
In 2005, he returned to college football as the North Carolina State Wolfpack offensive coordinator, guiding the Wolfpack to a win in the Meineke Car Care Bowl.  NFL
Trestman moved to the National Football League
and coached the running backs
with the Minnesota Vikings
. He became quarterbacks coach with the Tampa Bay Buccaneers
then held the same position with the Cleveland Browns
. In Cleveland he again coached Kosar and the team finished 10–6 and made the playoffs. He was promoted to offensive coordinator in 1989. That year Kosar passed for 3,533 yards and 18 TDs, wide receiver Webster Slaughter had a franchise record 1,236 receiving yards, and the Browns made it to the AFC Championship game.
, Trestman returned to Minnesota as quarterbacks coach for the Vikings. He spent two years there and then left coaching for three years. He returned to the NFL in 1995 as quarterbacks coach and offensive coordinator with San Francisco, where he served in that capacity through 1996. The first year he was there the 49ers led the NFL with 457 points scored, 644 pass attempts and 4,779 passing yards. Trestman joined the Detroit Lions as quarterbacks coach in 1997. That year Lion's quarterback Scott Mitchell passed for 3,484 yards, second most in team history.
In 1998 he was with the Arizona Cardinals as quarterbacks coach and offensive coordinator. That year quarterback Jake Plummer threw for 3,737 yards, and the Cardinals made the playoffs for the first time since 1982 and won their first post season game in 51 years. He next went to the Oakland Raiders in 2001 as the quarterbacks coach. In 2002 he was promoted to offensive coordinator and the Raiders led the NFL in total offense with 389.8 yards per game and passing yards with 279.7 per game. Under Trestman's guidance, Raiders QB Rich Gannon won the 2002 NFL MVP award as the Raiders reached Super Bowl XXXVII, losing to the Tampa Bay Buccaneers.
Trestman spent the 2004
season with the Miami Dolphins
before returning to the college ranks.  CFL
On December 18, 2007, Trestman was named head coach for the Montreal Alouettes of the Canadian Football League. The Alouettes narrowly lost 22–14 to the Calgary Stampeders
in the 2008 Grey Cup
championship game. At the conclusion of the season, he was nominated for the CFL's Annis Stukus Award as the league's top coach, with Calgary's John Hufnagel
winning. On March 5, 2010, Trestman won the Coach of the year award.
In 2009, Trestman led the Alouettes to win the 2009 Grey Cup
, winning with a thrilling field goal with no time left on the clock. After the season, it was announced that he was signed through the 2012 season as the head coach. Trestman also lead the Alouettes to a Grey Cup win in 2010. Under Trestman's guidance, Alouettes QB Anthony Calvillo won back-to-back MVP awards in 2009 and 2010.  NFL Draft Training Coach According to Trestman's website, "Marc has been one of the most trusted and respected QB coaches in the game. Which is why every off-season, the top NFL draft prospects call on Marc to work them out in preparation for the their Pro Day and the NFL Combine".
Some of the QBs who have been trained by Trestman include: Brandon Weeden (1st round pick by the Cleveland Browns), Brock Osweiler (2nd round pick by the Denver Broncos), Tim Tebow (1st round pick by the Denver Broncos), Jimmy Clausen (2nd round pick by the Carolina Panthers), Jay Cutler (1st round pick by the Denver Broncos) and Jason Campbell (1st round pick by the Washington Redskins).