# List of U.D.O. band members

U.D.O. are a German heavy metal band from Solingen. Formed in 1987 by eponymous vocalist Udo Dirkschneider following his departure from Accept, the group originally included guitarists Mathias Dieth and Peter Szigeti, bassist Frank Rittel and drummer Thomas Franke. The band released their debut album Animal House before the end of the year, after which Szigeti, Rittel and Franke were replaced by Andy Susemihl, Thomas Smuszynski (after a brief tenure for former Accept bassist Dieter Rubach) and future Accept drummer Stefan Schwarzmann, respectively. Wolla Böhm replaced Susemihl for 1990's Faceless World, although by the time of the next album Timebomb, U.D.O. were a four-piece. In 1992, after touring in promotion of Timebomb, U.D.O. disbanded as Dirkschneider returned to the reformed Accept.
Dirkschneider reformed U.D.O. in 1996 with Dieth and Schwarzmann, plus former Accept drummer Stefan Kaufmann on guitar and Michael Voss on bass, to record "Metal Gods" for A Tribute to Judas Priest: Legends of Metal. Dieth and Voss were soon replaced by Bullet members Jürgen Graf and Fitty Wienhold, respectively, for the band's next album Solid. Schwarzmann left after the release of No Limits. Graf also left around the same time, with Igor Gianola taking his place in time for the recording of Holy. Drums on the album were credited to "Guess Who", but were likely programmed by Kaufmann who did the same on earlier albums.
Schwarzmann's replacement was Lorenzo Milani, who joined U.D.O. in November 1999. Milani remained until January 2005, when he left the band for "personal reasons" and was replaced by Francesco Jovino, who had earlier filled in for the regular drummer during a tour the previous autumn. This lineup remained stable for over seven years, before Kaufmann left in September 2012 for "health reasons". He was replaced the following January by Andrey Smirnov, just days before Gianola was also replaced by Kasperi Heikkinen. Jovino left for "personal reasons" in December 2014, with Dirkschneider's son Sven taking his place the following February. Heikkinen remained until February 2017 before leaving, also citing "personal reasons" for his departure from both U.D.O. and related band Dirkschneider.
Bill Hudson took over from Heikkinen in March 2017, but by the following April had left due to musical differences. The band were temporarily rejoined by Kaufmann for a string of summer festival appearances. Shortly after the release of Steelfactory, long-time bassist Fitty Wienhold announced his departure from U.D.O., but assured fans that he would continue to offer his support in the form of songwriting if requested. The following month, the band announced the additions of guitarist Dee Dammers in place of Hudson, and bassist Tilen Hudrap in place of Wienhold. In September 2022 Hudrap was replaced by former Accept bassist Peter Baltes, first on a temporary bassist until April 2023 when Baltes officially replaced him.

## Members
### Current

| Name | Years active | Instruments | Release contributions |
| Udo Dirkschneider | 1987–19921996–present | vocals | all releases |
| Andrey Smirnov | 2013–present | guitarsbacking vocals | all releases from Steelhammer (2013) onwards |
| Sven Dirkschneider | 2015–present | drumsbacking vocals | all releases from Steelfactory (2018) onwards |
| Dee Dammers | 2018–present | guitarsbacking vocals | Game Over (2021) Touchdown (2023) |
| Peter Baltes | 2023–present | bassbacking vocals | Touchdown (2023) |

### Former

| Name | Years active | Instruments | Release contributions |
| Mathias Dieth | 1987–19921996 | guitarsbacking vocals | all releases from Animal House (1987) to "Metal Gods" (1996)No Limits (1998) – guest appearance on one track onlyMission No. X (2005) – guest appearance on one track onlyDominator (2009) – guest appearance on one track only |
| Thomas Franke | 1987–1988 | drums | Animal House (1987) |
| Peter Szigeti | 1987–1988 | guitars | Animal House (1987) |
| Frank Rittel | 1987–1988 | bass | Animal House (1987) |
| Stefan Schwarzmann | 1988–19921996–1998 | drums | all releases from Mean Machine (1989) to No Limits (1998) |
| Andy Susemihl | 1988–19901991 | guitars | Mean Machine (1989) |
| Dieter Rubach | 1988 | bass | none |
| Thomas Smuszynski | 1988–1992 | bass | Mean Machine (1989)Faceless World (1990)Timebomb (1991) |
| Wolla Böhm | 1989–1990 | guitars | Faceless World (1990) |
| Frank Fricke | 1991–1992 | guitars | none |
| Stefan Kaufmann | 1996–2012 (touring 2018) | guitarsbacking vocals | all releases from "Metal Gods" (1996) to Live in Sofia (2012) |
| Michael Voss | 1996 | bassbacking vocals | "Metal Gods" (1996) |
| Fitty Wienhold | 1996–2018 | bassbacking vocals | all releases from Solid (1997) to Steelfactory (2018) |
| Jürgen Graf | 1996–1998 | guitarsbacking vocals | Solid (1997)No Limits (1998) |
| Igor Gianola | 1998–2013 | guitarsbacking vocals | all releases from Holy (1999) to Live in Sofia (2012) |
| Lorenzo Milani | 1999–2005 | drums | all releases from Live from Russia (2001) to Thunderball (2004) |
| Francesco Jovino | 2005–2014 (touring 2004) | drums | all releases from Mission No. X (2005) to Navy Metal Night (2015) |
| Kasperi Heikkinen | 2013–2017 | guitars | all releases from Steelhammer (2013) to Navy Metal Night (2015) |
| Bill Hudson | 2017–2018 | guitars | none |
| Tilen Hudrap | 2018–2022 | bassbacking vocals | Game Over (2021) |

### Touring

| Name | Years active | Instruments | Release contributions |
| Winfred Clifton | 1999 | keyboards | none |
| Marcus Bielenberg | 2007 (substitute) | bass | none – Bielenberg substituted for Fitty Wienhold, who was unable to perform due to "private reasons" |
| Ulli Köllner | 2013–2015 | keyboards | Steelhammer: Live from Moscow (2014) |
| Harrison Young | 2015–2018 | keyboards | none |

## Lineups

| Period | Members | Releases |
| 1987–1988 | Udo Dirkschneider – lead vocals Mathias Dieth – guitars, backing vocals Peter Szigeti – guitars Frank Rittel – bass Thomas Franke – drums | Animal House (1987) |
| 1988 | Udo Dirkschneider – lead vocals Mathias Dieth – guitars, backing vocals Stefan Schwarzmann – drums Andy Susemihl – guitars Dieter Rubach – bass | none |
| 1988–1989 | Udo Dirkschneider – lead vocals Mathias Dieth – guitars, backing vocals Stefan Schwarzmann – drums Andy Susemihl – guitars Thomas Smuszynski – bass | Mean Machine (1989) |
| 1989–1990 | Udo Dirkschneider – lead vocals Mathias Dieth – guitars, backing vocals Stefan Schwarzmann – drums Thomas Smuszynski – bass Wolla Böhm – guitars | Faceless World (1990) |
| 1990–1991 | Udo Dirkschneider – lead vocals Mathias Dieth – guitars, backing vocals Stefan Schwarzmann – drums Thomas Smuszynski – bass | Timebomb (1991) |
| 1991–1992 | Udo Dirkschneider – lead vocals Mathias Dieth – guitars, backing vocals Stefan Schwarzmann – drums Thomas Smuszynski – bass Frank Fricke – guitars | none |
| Band inactive 1992–1996 |||
| 1996 | Udo Dirkschneider – lead vocals Mathias Dieth – guitars Stefan Schwarzmann – drums Stefan Kaufmann – guitars Michael Voss – bass | "Metal Gods" (1996) |
| 1996–1998 | Udo Dirkschneider – lead vocals Stefan Schwarzmann – drums Fitty Wienhold – bass, backing vocals Stefan Kaufmann – guitars, backing vocals Jürgen Graf – guitars, backing vocals | Solid (1997) No Limits (1998) |
| 1998–1999 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Stefan Kaufmann – guitars, backing vocals Igor Gianola – guitars, backing vocals | Holy (1999) |
| November 1999 – January 2005 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Stefan Kaufmann – guitars, backing vocals Igor Gianola – guitars, backing vocals Lorenzo Milani – drums | Live from Russia (2001) Man and Machine (2002) Nailed to Metal (2003) Thunderball (2004) |
| January 2005 – September 2012 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Stefan Kaufmann – guitars, backing vocals Igor Gianola – guitars, backing vocals Francesco Jovino – drums | Mission No. X (2005) Mastercutor (2007) Mastercutor Alive (2008) Dominator (2009) Rev-Raptor (2011) Live in Sofia (2012) |
| January 2013 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Igor Gianola – guitars, backing vocals Francesco Jovino – drums Andrey Smirnov – guitars | none |
| January 2013 – December 2014 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Francesco Jovino – drums Andrey Smirnov – guitars Kasperi Heikkinen – guitars | Steelhammer (2013) Steelhammer: Live from Moscow (2014) Decadent (2015) Navy Metal Night (2015) |
| February 2015 – February 2017 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Andrey Smirnov – guitars Kasperi Heikkinen – guitars Sven Dirkschneider – drums | none |
| March 2017 – April 2018 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Andrey Smirnov – guitars Sven Dirkschneider – drums Bill Hudson – guitars | none |
| April – September 2018 | Udo Dirkschneider – lead vocals Fitty Wienhold – bass, backing vocals Andrey Smirnov – guitars Sven Dirkschneider – drums Stefan Kaufmann – guitars, backing vocals (touring) | Steelfactory (2018) |
| October 2018 – December 2022 | Udo Dirkschneider – lead vocals Andrey Smirnov – guitars Sven Dirkschneider – drums Dee Dammers – guitars Tilen Hudrap – bass | Game Over (2021) |
| April 2023 – present | Udo Dirkschneider – lead vocals Andrey Smirnov – guitars Sven Dirkschneider – drums Dee Dammers – guitars Peter Baltes – bass | Touchdown (2023) |