Bert has been a full-time bookseller since 1976 when he opened a secondhand book store in Derry, NH. In 1978 he decided to specialize in the modern first editions field. He moved the business into his home and started issuing catalogs and doing trade shows. He has been at it ever since. Bert is a member of the New Hampshire Antiquarian Bookseller Association, the Antiquarian Booksellers' Association of America (ABAA) (since 1982) and the International League of Antiquarian Booksellers (ILAB).