|Date of birth||23 August 1982|
|Place of birth||Mayen, West Germany|
|Height||1.80 m (5 ft 11 in)|
|Playing position||Defensive midfielder|
|Huddersfield Town (manager)|
|2016–2017||VfL Bochum U19|
|2017–2019||Borussia Dortmund II|
|* Senior club appearances and goals counted for the domestic league only|
Siewert trained at the Hennes-Weisweiler-Akademie. After working as the assistant manager for the German under-17 and under-18 national teams, Siewert signed a 3-year contract to become manager of German fourth-tier side Rot-Weiss Essen in June 2015. He was sacked by the club in April 2016 after the club entered the relegation zone. Siewert then became assistant manager of VfL Bochum, manager of the VfL Bochum under-19 team, and manager of Borussia Dortmund II.
In January 2019 he was linked with the vacant manager's position at Premier League club Huddersfield Town, and later that month he was appointed to the role, signing a contract until the summer of 2021. In doing so he became the third Borussia Dortmund II manager in a row to leave that role to work in England; after David Wagner (who he replaced at Huddersfield) and Daniel Farke (who became manager of Norwich City). Siewert stated that he did not wish to be compared to Wagner, his predecessor at Huddersfield.
- As of match played 9 February 2019
|Rot-Weiss Essen||15 June 2015||3 April 2016||29||7||12||10||24.14|||
|Borussia Dortmund II||16 June 2017||21 January 2019||55||25||15||15||45.45|||
|Huddersfield Town||21 January 2019||Present||3||0||0||3||0.00|||
- "Profile". World Football. Retrieved 21 January 2019.
- Ralf Wilhelm (15 June 2015). "Jan Siewert ist der neue Trainer von Rot-Weiss Essen" (in German). Waz. Retrieved 21 January 2019.
- "Rot-Weiss Essen trennt sich von Trainer Jan Siewert" (in German). Der Westen. 3 April 2016. Retrieved 21 January 2019.
- "Profile" (in German). DFB. Retrieved 22 January 2019.
- "Jan Siewert considered by Huddersfield to replace David Wagner". Sky Sports. 18 January 2019. Retrieved 21 January 2019.
- Simon Stone (21 January 2019). "Jan Siewert: Huddersfield expected to name new manager within 24 hours". BBC Sport. Retrieved 21 January 2019.
- "Huddersfield Town appoint Jan Siewert from Borussia Dortmund as new manager". BBC Sport. 21 January 2019. Retrieved 21 January 2019.
- Simon Stone (22 January 2019). "Jan Siewert: How have three Borussia Dortmund coaches ended up in England?". BBC Sport. Retrieved 22 January 2019.
- "Jan Siewert: New Huddersfield Town boss does not want David Wagner comparison". BBC Sport. 22 January 2019. Retrieved 22 January 2019.
- Jan Siewert management career statistics at Soccerbase
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