Derek is the Principal at Ziman and Ziman Solicitors. He brings a wealth of decades of experience to his practice in North Sydney in general practice but has focussed at various times on litigation, commercial law, franchising, building and construction law, conveyancing, family law and every aspect of legal practice which affects business owners.

In 1973 Derek qualified as a practitioner in South Africa where he practiced as a partner in a family practice which was originally founded by his father Hyme Ziman in 1932 in Pretoria, South Africa. Hyme Ziman practiced for many decades and eventually passed away in 2002 at the age of 94 as the oldest practitioner in South Africa at the time. Derek applies the same values and ethics to his practice in North Sydney today and has firmly established the same essential traditions and sense of dedication and commitment to the law which his father had.

In 1995 Derek emigrated to Australia with his wife and two sons. He has now accumulated over 14 years of experience in Australian law and business.

He re-qualified as a practitioner in New South Wales at the University of Sydney and was admitted in the New South Wales Supreme Court on 3 October 2003. Shortly after he was admitted to the High Court of Australia. He began his Sydney career with David Landa Stewart where apart from his own large following he handled a substantial portfolio of medical negligence matters. He was instrumental in having the firm enrolled as panel solicitors for some of the largest financial institutions in Australia and gained a thorough grounding in mortgage and property work. He also practised as a registered Migration Agent for some time. He was admitted a a Notary Public on 6 October 2009. He has worked with a series of high profile clients in the time since his admission and opened his own practice, Ziman and Ziman Solicitors in North Sydney.