There he oversaw the construction of the enlarged Royal Artillery Hospital: the Royal Ordnance Hospital dated from about 1780, and the enlargement was completed in 1806 (the building later became the Connaught Barracks).
Doctorate 1809) was a Scottish military surgeon, now known for his work on a diabetic diet. He became a surgeon in the Royal Artillery in 1776, and then served in the West Indies. In 1778 the University of Street Andrews made him Doctor of Medicine He was stationed in Saint Lucia in 1778-1779 and in Barbados in 1781.
His associates included Colin Chisholm on Grenada.
Rollo became surgeon-general of the Royal Artillery in 1794, and returned to the Royal Military Academy, Woolwich. From 1804 he was inspector of hospitals for the Ordnance.
Rollo was frequently consulted about cases of diabetes, and in treatment had some success with the use of a nitrogenous diet. He died at Woolwich on 23 December 1809, and was buried at Plumstead.