Lord Hereford joined BonhamsAuctioneers upon graduation in 1998, where, as Robin Hereford, he has been director of valuations since 2007.
The elder son of Robert Milo Leicester Devereux, 18th Viscount Hereford, upon his father's death in 2004, he succeeded to the titles becoming the 19th Viscount Hereford and a baronet. Until such time as the Viscount has a son, the heir presumptive to the title is his younger brother the Hon. Edward Mark de Breteuil Devereux (b. 1977).
Lord Hereford married Louisa Knight, a textiles designer, on 12 June 2010. Their daughter, the Hon. Sophia Emily Florence Devereux, was born on 12 January 2013. He is a member of White's Club.