Mould said in an interview broadcast in January 2012 that one of the biggest challenges was engaging with a shifting body politic having served, in his term, under five Premiers and six Ministers. The same interview also revealed Mould’s interest in Islamic architecture His works include Sydney College of the Arts, St Mary’s Cathedral conservation; master plans for Circular Quay, Sydney Fish Markets, Walsh Bay Arts Precinct; as well as schools, courthouses and police stations. In 2010 he established the Eminent Architects Panel for the Sydney Opera House to advise on architecture and design as it embarked on a major renewal program.