Our Team

Andrew Chaloner

Founding Director, CEO

Andrew has co ordinated and driven Stream from its origins as a shell company, to the point where its new innovative materials technology and products are on the market. Prior to founding Stream, Andrew spent a large proportion of his career as an officer and helicopter pilot in the military, and in commercial aviation.


Michelle Waterfall

Founding Director, COO

Michelle has been a Surgeon Practitioner for over 17 years specialising in cardiac and orthopedic surgery, with responsibilities for management of junior doctors’ in house training and surgical skills, along with day to day NHS departmental management. Michelle has also ran her own dental cosmetics business for 4 years.


Steve Self

Commercial Director

Steve brings a wealth of experience to Stream, joining from e-Therapeutics Ltd. His career began in The Wellcome Foundation, in R&D and Operations. He rose to become the Head of Project Management for the Wellcome Group, involved in all aspects of NCE and NBE development, driving the overall strategy, portfolio review and with full responsibility for budgets/financial control.


Prof. Mark Green

Director of Research

Mark is Professor of Nanotechnology at Kings College London responsible for a 15 person research group exploring the interface between nanomaterials and biology; a post-doctoral fellow at Imperial College & University of Oxford, Mark also worked as a Scientist at Oxonica Ltd for 4 years before joining King’s as a lecturer in bio-nanotechnology in 2004, progressing to Senior Lecturer, Reader, before becoming a Professor in 2014.


Dr. Dermott O’Callaghan

Head of Product Development

Dermott is an accomplished molecular biologist with over 16 years experience in the pharmaceutical industry working for AstraZeneca, Pfizer and as an independent consultant. During this time he gained extensive scientific and technical expertise in all stages of product development, project management and drug discovery, from target identification to candidate drug selection.


Dr. David Howat

Director of Medtech & Therapeutic Development

David has over 25 years experience in pharmaceutical industry R&D and is the former Chief Development Officer at Haoma Medica, formally head of R&D for Evgen Pharma. Prior, David has been a Freelance Preclinical Development and Project Management Consultant.