Through his uncle, stockbroker Percy Ricardo of Bramley Park, he was a first cousin of Amy Gordon-Lennox, Countess of March (wife of Charles Gordon-Lennox, 7th Duke of Richmond, before he inherited the dukedom), Ellen Maud Ricard (wife of Sir Hervey Bruce, 4th Baronet), Col. Horace Ricardo, and Col. F. C.
[3] He established his practice in 1878, and for 10 years worked in partnership with William De Morgan (1839–1917), for whom he designed tiles, vases, and other artefacts.
He advocated the use of glazed materials to resist the polluted atmosphere of nineteenth century London.
In this, he anticipated the designs of Otto Wagner in Vienna, who used coloured tiles set in the same planes as walls and piers to suggest architectural features.
[4] In 1882, Halsey designed a mantelpiece for the house at Buckminster Park, then the seat for the Earls of Dysart.