ran his own studio in Karachi, Sindh Province in the early 1900s. His sepia postcards
of the neighboring province of Baluchistan were quite popular and
re-published by Quetta-based firms like Mullick Brothers and R.W.
Rai & Sons. They seem far more common than his postcards of Sindh. Unlike another early photographer of Baluchistan who
focused on the official Raj, Fred Bremner, Marrott concentrated
on the wide variety of people in Baluchistan and he really did a comprehensive job of tracing the province's people and events. The Brahuis of the
semi-independent Kalat state were among his most common subjects.