Daniel Dean Warthen was born on December 1, 1952 in Omaha, Nebraska. Warthen was an All American High School quarterback, getting scholarship offers from Nebraska, USC, UCLA, & Northwestern universities. He chose to play baseball instead, getting signed second round, by the Montreal Expos in 1971.
The left hander would get brought up to the majors in May 1975 making his debut against the Big Red Machine. He pitched in relief in his first few outings, going 4-2 with three saves toward the end of July. He was thrown into the Expo rotation finishing the season at 8-6 with 3.11 ERA, striking out an impressive 128 batters in 167 innings. He also walked 87 batters. The following year he was 2-10 as he walked 66 batters in 90 innings pitched allowing 53 earned runs.
He would only pitch 20 more games in the majors at Montreal, Philadelphia & Houston over the next two seasons, going 2-5. In the minors he would win 10 games or more three times, pitching down there through 1982. In 1978 he was the AA Pitcher of the Year at Oklahoma City.
Retirement: Warthen immediately began to coach when his playing days ended, first with the Pittsburgh Pirates, then with the San Diego Padres & Philadelphia Phillies organizations. In 1992 he was the Seattle Mariners pitching coach, moving to the San Diego Padres (1996-1997) then Detroit Tigers in (1998-2002).
In 2003 he came to the Mets organization, as pitching coach for the Norfolk Tides. He remained there for three seasons, tutoring guys like Heath Bell, Pedro Feliciano, & Aaron Heilman. In 2006 & 2007 he went to the Dodgers serving as pitching coach under Grady Little.
In June of 2008 Warthen was named the Mets pitching coach replacing Rick Peterson. In 2009 he served under manager Jerry Manuel & his pitching staff posted a 4.45 ERA, which was 12th in the league. In 2010 his staff improved to 6th best in the league posting a 3.73 ERA.
In 2011 the Met staff won 77 games (10th in the NL) posting a 4.19 ERA (13th in the NL) they tossed six complete games which was their highest ranking in the league stats, fifth place. They averaged in the middle of the league allowing HRs (147-8th in the NL) walks (514- also 8th) & 1126 strikeouts (10th).
In 2012 the Mets staff featured twenty game winner R.A. Dickey but other than that the staff only won 54 games. Their total 74 wins was 12th best in the league & their 4.09 ERA was eleventh best. Thanks to Dickey they were second with seven complete games & third in shut outs with five. The teams 1240 strike outs stood out & were sixth best in the league.
In July of 2012 Warthen was ejected then later fined after arguing balls & strikes with umpire C.B. Bucknor in game Johan Santana pitched in Atlanta. In The off season the Mets announced their entire coaching staff would return in 2013.