Our People - Principals

Margaret Doucas

Margaret Doucas, is a Principal of Henry Hughes and a Partner in Henry Hughes & Co. With a background in Science and Law, Margaret has more than 25 years experience providing strategic Intellectual Property protection and enforcement advice to global clients. Margaret’s Patent Law practice focuses on Life Sciences (Pharmaceuticals and Biotechnology)... More

Mark Eftimov

Mark Eftimov is a registered Patent Attorney in New Zealand and in Australia. Mark has over 35 years of experience in the area of Intellectual Property law and he now practises in the areas of industrial designs, patents and trade marks for Henry Hughes’ international and national clients... More

Frank Callus

Frank Callus qualified as a UK and European Patent Attorney before joining Henry Hughes in 1986. He became a Principal of Henry Hughes in 1991. He has a bio-physics background and, with the experience gained in English and European Patent Law, prior to joining Henry Hughes, has over 20 years experience in Intellectual Property Law... More

Barbara Sullivan

Barbara Sullivan is a Principal of Henry Hughes and a Partner in Henry Hughes & Co. Barbara has more than 25 years extensive experience advising global and national clients. She provides strategic Intellectual Property advice, mainly in the areas of trade marks and copyright, Fair Trading Act, passing off and licensing... More

Elena Szentivanyi