In addition to his career as an architect, Gruzman was an active furniture designer of built-in cabinetry, chairs, tables, benches and seating for the 1957 South Head Synagogue (Rose Bay NSW), the Montrose Apartments (1954), North Sydney, Parnell Motors, Arncliffe (1955) and many of his domestic commissions. He also had associations with furniture-maker Paul Kafka and formed the "Furniture Design Group" in 1956.