Selwyn is a Fellow of the Institute of Chartered Accountants and has operated an accounting practice in Malvern since 1987. It is literally a family practice that includes his wife Hannah, son Jay and daughter Bonnie, all qualified accountants. The Greenbergs service small-to-medium-sized businesses in accounting and income tax matters and assist high-wealth individuals with bookkeeping, income tax, superannuation, and estate planning. Selwyn has been an active member of the Emmy Finance committee since 2009.  

In between his work, Emmy Monash commitments, and his five children and ten grandchildren, Selwyn can be found playing golf at the Cranbourne Golf Club when time permits.