In the 1980s, he moved to the Royal Swedish Opera and Drottningholms slottsteater [sv] in Stockholm, singing the parts of Escamillo in Carmen and Tevje in Fiddler on the Roof.
In the late 1990s, he had major roles in musicals like Cyrano de Bergerac, Cabaret and The Showboat for which he earned prize nominations and good critical receptions.
In 2007, Samuelson showed his comedic side playing the role as Magnus in the Swedish comedy film Min frus förste älskare [sv] ("My Wife's First Lover"), for which he became well-known.
In his film career, Samuelson is best-known for his role as the Investigator in Håkan Alexandersson [sv]'s 1987 thriller movie Res aldrig på enkel biljett ("Never travel on a one-way ticket").
His other films include Min frus förste älskare (2006), En liten Tiger, (2006), Aladdin (1992), Kronbruden (1990), Spårvagn till havet (1987), and Kärleken är allt (1986).