In der Mühlen was born in Braunschweig Germany and lives in New York City and Zagreb. Both of his parents, Johannes Willhelm in der Mühlen and Stana Kovacic in der Mühlen were architects. He studied at MIOC XV Gymnasium computer science and continued at Faculty of Science, University of Zagreb Mathematics.
In der Mühlen started as a computer animation designer and coder for the quiz show Kviskoteka hosted by Oliver Mlakar, which aired from 1977 to 1990s on Croatian Radiotelevision, and later briefly aired on Nova TV.
In der Mühlen has produced and performed live on productions from New York City, Los Angeles, Japan, Croatia, Italy and Serbia. He worked with Harold Perrineau, Styles P, Masta Ace, Muzz Skillings, Coati Mundi, Buddy Hankerson, Vernon Reid, Rade Šerbedžija, Bashiri Johnson, Ekatarina Velika, muMs da Schemer, Kurtis Blow, Risa Hirako – Lotta Love, Parni Valjak, Dino Merlin, Haustor, Cacadou Look, Josipa Lisac, Pankrti, Plavi orkestar, Alka Vuica, Željko Bebek, Mitar Subotić, Electro Team, Dubrovnik Summer Festival, Karlowy Vary, Bolesna Braća, Nikša Bratoš, Budjenje.
From 1985 to 1990, in der Mühlen was a partner with Vladimir Smolec in the SIM studio, which produced numerous records from a variety of notable Yugoslav artists. From 1987 to 1992, he managed the bar at the youth centre Kulušić. He was part of the NYC scene in the 90' performing in clubs Brownie's, CBGB, Mercury Lounge, The Pyramid Club, Don Hill’s, Roxy NYC, Lion's Den (nightclub), Downtime, Webster Hall.
In 1988, in der Mühlen founded IDM Music in Düsseldorf, Germany, a music publishing and rights management company which in 1992 relocated to New York City and merged with IC & M managed by Miriam Westercappel. IDM music has collaborated with Quentin Tarantino on his movies: Kill Bill Volume 1, Death Proof, Grind House, Inglourious Basterds and Django Unchained. IDM has worked also on: Silver Linings Playbook, American Hustle, The Sopranos, Goodfellas and commercials for Microsoft, Dolce & Gabbana, Miller Brewing Company.
With IDM Music, in der Mühlen produced music for RTL Television, Vipnet, T-Mobile, Nova TV (Croatia) and Central European Media Enterprises.
He is one of the judges on the Croatian version of Your Face Sounds Familiar - Tvoje lice zvuči poznato (Croatian season 1) and Tvoje lice zvuči poznato (Croatian season 2).
Tomo's TV work as an Executive music producer includes :
• Croatian version of Your Face Sounds Familiar - Tvoje lice zvuči poznato (Croatian season 1)
• Croatian version of Your Face Sounds Familiar - Tvoje lice zvuči poznato (Croatian season 2)
• Croatian version of Your Face Sounds Familiar - Tvoje lice zvuči poznato (Croatian season 3)
• Croatian 2015 and 2016 version of The Voice of Holland
• Croatian 2016 version of Got Talent - Supertalent