Ross was admitted a freeman of Norwich in 1589 and remained heavily involved in corporation affairs until his removal from the aldermanic body in 1642 for supporting the king.
As was customary for Norwich Members, Ross served only once in Parliament. His contribution to the 1621 assembly was small. On 2 May he proposed that the bill for the better relief of the poor in London be extended to encompass other regions.
Ross drafted his will in July 1643, which was proved on 10 Apr. 1645. In it he left Norwich properties in St. Mary’s, St. Martin-in-the-Oak and St. Peter of Southgate to his son, Richard, while his daughter, Susan, was granted his other (unspecified) landholdings.
