Marcel Karl Jacob (30 January 1964 – 21 July 2009) was a Swedish musician, best known as the founder, chief songwriter, and bassist of the hard rock band Talisman.

During his time in Force, Jacob wrote the song "Black Journey Through My Soul" together with vocalist Joey Tempest.

In 1989 Jacob was back in the USA, auditioned for Dio and played on Jeff Scott Soto's other band Eyes's debut.

In 1992, Jacob played on a song with Lion's Share, "Nothing's Free", which was included on a Belgian compilation and in 1993 he was guest musician on ex-Candlemass singer Thomas Vikström's solo album If I Could Fly.

[5] In 2005, Jacob was one of three new players to participate in the Swedish/German hard rock band Last Autumn's Dream, for its second studio album, along with drummer Jamie Borger and keyboarder Thomas Lassar.

They were hired to replace John Levén, Ian Haugland and Mic Michaeli, who played on the debut album, but who could not make it this time due to taking part in the Europe reunion.