Ullmanns Vater ist Schauspieler und leitete seine eigene Schauspieleragentur in Hamburg. Seine halbindische Mutter ist Tänzerin, seine Schwester Shantia Ullmann auch Schauspielerin. So stand Ullmann schon im Alter von elf Jahren auf der Bühne des Ernst Deutsch Theaters in Hamburg. 1996 bekam er eine Rolle in der Fernsehserie Alphateam unter der Regie von Norbert Schulze. Kurz darauf war er in dem Kurzfilm Das Rennen von Oleg Skworzow zu sehen. Nach diversen Auftritten in Serien-Episoden erhielt Ullmann 1999 eine durchgehende Rolle in der Serie Zwei Männer am Herd. Nebenbei war er in dem KurzfilmStrandnähe von Till Endemann und in Albtraum einer Ehe von Johannes Fabrick zu sehen.
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as Jonas Vinson
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as Max Toma
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as Lucy's Father
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as Rico Weber
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as Klaus Störtebeker
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as Ben
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as Matti Rosner
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as Samuel
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as Tyske Roy
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as Ben Hoffmann
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as Jakob
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as Self
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as Vincenzo Marconi (jung)
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as Junger Vincenzo
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as Jasper
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as Daniel
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as Tom Färber
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as Self
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as Datty
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as Saliya Kahawatte
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as Theo
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as James A. P. Pimplebottom
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as Leo Schmackes
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as Self
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as Celal Yildiz
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as Tom
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as Schulgeist James Pimplebottom
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as Rasheed
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as himself
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as Ronny
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as James
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as Klaus, jung
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as Luca
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as Polizist
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as Holger
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as Tim Berners
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as Oliver
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as Rio Bosch
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as Chriz
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as Junis
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as Rainer Schröder
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as Herbergsvater Max
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as Schneider David
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as Momme Ulmer
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as Marco Kaiser
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as Luca
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as Demetrios
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as Jan Winkler
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as Fabian Bergius
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as Michael Schiffer
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as Richie Renner
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as Antonio De Vita
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as Rafael
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as Jan
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as Martin
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as Benjamin Amberg
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as Frank
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as Dominik Brennecke
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as Raja Arumugan
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as Deniz Ghubar / Arian Bakhtari
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as Kerim Korkmaz
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as Marc Landauer
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as Roger Stahl
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as Nicolai