Robert Mack was a Dublin architect who is perhaps best known for having designed Powerscourt House, Dublin (1771), for Richard Wingfield, 3rd 3rd Earl of Powerscourt (1730-1788). The house which is built out of granite mined from the Powerscourt estate in Wicklow took three years to build, cost some /P80,000, and is one of the finest 18th Century mansions in Dublin. Among his other designs are the Essex Bridge, Dublin (1753-6), the monument to Lady Catherine Somerville in Kentstowne Church, Co. Meath, and the Bridge at Newbridge House (1777).
John Trotter studied at the Dublin Society Schools, where his drawing was greatly admired and he won three Premiums. He then travelled to Italy in circa 1759 returning to Dublin by 1773 where he set up as a portrait painter.