Sigbjørn specializes in labor law, helping Norwegian and international companies navigate and comply with the Working Environment Act (arbeidsmiljøloven). He also advises on related matters within corporate law, tax law, and contract law. Sigbjørn joined Aider Legal after graduating from the University of Tromsø in spring 2023, where his master's thesis examined termination due to workplace harassment. He also completed part of his education at Vrije Universiteit in Brussels.