Our People

Our leadership team has experience from discovery through to commercialisation

Bob Duggan

Chief Executive Officer‍

Mr Robert W. Duggan is a serial US based entrepreneur who has built several successful companies across different industries, including biotechnology. Mr Duggan is currently the Chief Executive Officer of Duggan Investment Inc., a private US investment firm. Mr Duggan has served on the boards of a number of US public and private companies and he is currently chairman of the board of the Nasdaq listed company, Pulse Biosciences, Inc. He was previously a substantial shareholder in and the Chairman of the Board and Chief Executive Officer of Pharmacyclics, Inc., which was sold to AbbVie Inc., in 2015. Previously, he was the Chairman of the Board and Chief Executive Officer of Computer Motion, Inc., which later merged with Intuitive Surgical, Inc.

Ventzislav Stefanov

Executive Vice President and President of Discuva‍

Dr Ventzislav Stefanov joined our company in December of 2019 as Non-Executive Director and took executive position in April 2020. Previously he was independent consultant providing advice, including to Duggan Investments Inc, on the therapeutic and commercial prospects of marketed and investigational antibiotics. In his previous tenures, Dr Stefanov held commercial  and marketing positions with Bayer, Merck Sharp & Dohme, AstraZeneca and Eli Lilly. He had been involved in launching and marketing across Europe several classes of antibiotics including quinolones, carbapenems, cephalosporins and vancomycin. Dr Stefanov received his MD degree from the Medical University in Sofia, Bulgaria.

Mike Donaldson

Chief Financial Officer‍

Mr Donaldson joins Summit from Goldfinch Bio, Inc., where he led finance and accounting as Vice President, Finance, and Corporate Controller. Previously, he served as Vice President, Finance, Corporate Controller and Assistant Treasurer at ARIAD Pharmaceuticals, Inc., which was acquired by Takeda for $5.2 billion in February 2017. Prior to that, he was the Corporate Controller for Hittite Microwave Corporation, which was acquired by Analog Devices for $2.4 billion in July 2014. Mr Donaldson spent the first 11 years of his career at PricewaterhouseCoopers. He received his undergraduate degree in accounting and information systems from the University of Massachusetts and is a Certified Public Accountant in Massachusetts.

Jos Houbiers

Chief Medical Officer‍

Jos Houbiers has served as our Chief Medical Officer since July of 2020 and was previously our Vice President of Research and Development and Global Head Drug Safety. Dr Houbiers brings to Summit over 20 years of experience in pharmaceutical clinical development, where he’s implemented clinical development strategies, creative trial design and comprehensive medical safety monitoring across therapeutic areas, including functional urology, immunology and transplantation. He was most recently at Astellas, where he served in roles of increasing responsibility in clinical development from the Global Development hub, where he ended as Executive Medical Director and Group Head for the Medical Science Urology department. Dr. Houbiers received his MD from Leiden University Medical Center and PhD (immunology) and MSc in medicine from Leiden University.

Dave Powell

Chief Scientific Officer‍

Dr Dave Powell joined Summit from GSK where he served as Director and Head of the Crick-GSK Biomedical LinkLabs, based at GSK’s UK R&D hub at Stevenage, UK, and The Francis Crick Institute in London.

Dr Powell held a number of positions of increasing seniority in his time at GSK. As part of his work there, he participated in antibiotic discovery, assay development, high throughput screening design and implementation, and lead optimisation support. In his most recent role at GSK, he led a collaboration with the Crick Institute, in addition to providing support to GSK’s ‘Discovery Partnerships with Academia’ team which collaborated with academic groups in downstream drug discovery. He was awarded a BSc and MSc from the National University of Ireland Galway, before completing a PhD in biochemistry at Cardiff University.