Thomas Brook was a land surveyor.
He was articled to land surveyor Mr. Dinsley of Huddersfield and then to George Crowther of Huddersfield, before becoming a local engineer for the Leeds & Liverpool Canal company.
He then became the surveyor of the Ramsden Estate for Sir John William Ramsden for around 25 years before setting up his own business circa 1861 which became Thomas Brook & Nephew. Amongst his pupils was John Henry Abbey.
He married Elizabeth Child of Shelley, daughter of manufacturer William Child, on 30 April 1846 at All Hallows, Kirkburton. It is believed the couple did not have children.
He was elected onto the first Moldgreen Local Board in June 1859.
By 1861, they were residing at Colne Villa near Aspley, and were instrumental in the building of the nearby Mission Church. Within a few years they had moved to Hartley Cottage near Thunder Bridge and were involved with the building of Emmanuel Church at Shelley in the late 1860s.
Elizabeth Brook died aged 56 in 1881 and was buried at All Hallows, Kirkburton, in her parents' plot.
Thomas Brook died aged 67 on 22 December 1886 "after a lingering illness" and was buried with his wife on Christmas Eve. He left an estate valued at £13,314 4s.