Hoiseck studied drama at Stockholm's Theater School and at the Lee Strasberg School and received his Bachelor of Arts in drama from the Columbia College. Beside several Swedish television and film projects, he also portrayed lead and supporting roles in various stage plays, including The American Dream and Anderson Trial.
Since his acting debut in the early '70s, Hoiseck has also appeared on television series such as Fantasy Island (1980, with Elinor Donahue and John Schuck), Best of the West (1982), and Superior Court. Among his film resume are the drama The Competition (1980, with James B. Sikking), the drama Table for Five (1983), the comedy Splash (1984, with Charles Macaulay, Valerie Wildman, Clint Howard, Bill Smitrovich, and Jill Jacobson), the comedy Remote (1993), Squanderers (1996, with Cole McKay, Viola Stimpson, and Kyla Kuhner), and the romance The Annihilation of Fish (1999). More recently he served as co-producer, casting director, and in a supporting role in the thriller Alibi (2007, with Irene Tsu), as casting director and in a supporting role in the short film The Singer Downstairs (2007), played the role of O'Roark in the drama The Seekers (2008, with Shelly Desai and Joseph Culp), and as casting director for the crime drama Born to Kill (2009, with an in memory of dedication for Lawrence Tierney).