 After graduating, Knatchbull-Hugessen spent a year as a teacher at Eton before training as a barrister, being called to the bar in 1890.He married Helena Regina Frederica Flesch von Brunningen, daughter of the Austrian nobleman Hermann Flesch Edler von Brunningen, on 8 November 1893.He succeeded to the title Baron Brabourne in 1915, following the death of his nephew Wyndham Knatchbull-Hugessen.