Brewer was a native of Trowbridge in Wiltshire, where he possessed a small estate, and was engaged in the woolen manufacture, but seems to have been unsuccessful in business.
He communicated some plants to Dillenius for the third edition of John Ray's Synopsis, published in 1724, and accompanied the editor in 1726 from Trowbridge to the Mendips, and from there to Bristol, passing onward to North Wales and Anglesey.
"[3] Brewer's son was sent to India through the influence of Dr. James Sherard of Eltham, but the father quarrelled with the doctor in 1731 about some plants.
[2] He died at Bierley, at Mr. John Pollard's house where he was buried close to the east wall of Cleckheaton chapel.
Although unfortunate in business, he was a good collector of plants, insects, and birds; the botanical genus Breweria was founded by Robert Brown in his honour, and a species of rock-rose, a native of North Wales, discovered by him, bears the name of Helianthemum breweri.