Gustav is on the board of the Toronto chapter of Entrepreneurs Organization (EO), the largest community of business owners, with a mission to empower, grow and learn.

He is a member of the Toronto City Bar Association and the Ontario Bar Association. He is also in the Business Law and the Entertainment, Arts and Sports Law sections of the Ontario Bar Association. Gustav is the Founding Member of the Business Lawyers Group, the Managing Partners Group and the Entertainment Lawyers Group in Toronto, each a diverse network of seasoned attorneys.