Date of birth: 24 November 1970
Playing career: VfL Wangen, VfB Stuttgart (twice), TSV 1860 München, VfL Wolfsburg, 1. FC Köln, Eintracht Frankfurt
Coaching career: VfB Stuttgart (youth), VfB Stuttgart, FC Schalke 04 (youth), FC Schalke 04
• Having risen through Stuttgart's youth department, Keller made his first and only Bundesliga appearance in 1990 before leaving for third-tier 1860 München, where he helped the club to win promotion to the second and then first divisions.
• A fringe player in the Bundesliga, he moved to second division Wolfsburg and again won promotion, subsequently becoming a top-flight regular and earning a return to Stuttgart, where he played in the 1998/99 UEFA Cup.
• Joined Köln in 2000 but relegated two years later, prompting a switch to Eintracht, whom he helped into the Bundesliga only to miss most of the season with cartilage damage; relegation and further injury problems led to retirement in 2005.
• Took over Stuttgart's Under-19 side in 2008/09 and became Christian Gross's assistant with the first team in December 2009; the following October, replaced Gross as head coach but lasted only two months before making way for Bruno Labbadia, although Keller continued to work for the club as a scout.
• Appointed Schalke's U17 coach in summer 2012; on 16 December that year he stepped up to the senior side following Huub Stevens' departure and took the club to fourth place and a UEFA Champions League berth. Went one better in 2013/14 as Schalke finished third.
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|21.08.2013||UEFA Champions League||Play-offs||Schalke||1-1||PAOK|
|27.08.2013||UEFA Champions League||Play-offs||PAOK||2-3||Schalke|
|18.09.2013||UEFA Champions League||Group stage||Schalke||3-0||Steaua|
|01.10.2013||UEFA Champions League||Group stage||Basel||0-1||Schalke|
|22.10.2013||UEFA Champions League||Group stage||Schalke||0-3||Chelsea|
|06.11.2013||UEFA Champions League||Group stage||Chelsea||3-0||Schalke|
|26.11.2013||UEFA Champions League||Group stage||Steaua||0-0||Schalke|
|11.12.2013||UEFA Champions League||Group stage||Schalke||2-0||Basel|
|26.02.2014||UEFA Champions League||Round of 16||Schalke||1-6||Real Madrid|
|18.03.2014||UEFA Champions League||Round of 16||Real Madrid||3-1||Schalke|
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