Diane attended Rhodes University, where she read for a BA (law), LLB and PGD in International Studies, qualifying as an Attorney in 2000. Shortly thereafter Diane moved to England where she lived and practised law over a 10 year period, first working as a Foreign Lawyer and thereafter qualifying as an English Solicitor.

During her practice in London Diane joined the London based City law firm, Holman Fenwick & Willan, and worked for 7 years in their London based office, specialising in international dispute resolution and assisting high profile corporate clients across the globe, including the London market, Australia, USA, North African and Europe on commercial issues arising from reinsurance disputes, commutations, run-off business and managing treaty claims.

Diane returned to South African in 2012 and joined AC De Sousa Attorneys, and manages their Grahamstown branch office in the Eastern Cape, focusing on personal injury litigation, in particular medical negligence.