Darsh Shah
Darsh Shah is an Audit, Assurance & Advisory partner at Blick Rothenberg. He has over 20 years of experience in professional practice and specialises in auditing and financial reporting to clients ranging from start‐ups to large international groups in the hospitality, care, recruitment and retail sector. Prior to joining Blick Rothenberg, Darsh was a partner
at an independent London practice, having spent a number of years at Deloitte LLP before that.
He is an FCA (Fellow of the Institute of Chartered Accountants) and has a BSc in Management Sciences from The University of Manchester.
Darsh joined the Orbis UK board in December 2022.
Sir Dominic Asquith
Nominations Committee Chair, UK
After a number of years as a political analyst, teacher, journalist and traveller in the Middle East, Dominic Asquith joined the British diplomatic service in 1983. He served in the Americas, South Asia and returned frequently to the Middle East. He was Ambassador successively in Iraq, Egypt and Libya between 2006 and 2012. After retiring in 2013, he was recalled to government service as High Commissioner in India from 2016 to 2020. He is currently a Partner in Macro Advisory Partners, which provides independent, long‐term strategic counsel to decision‐makers in business and government.
Sir Dominic joined the Orbis UK board in October 2020.
Fiona Hobbs
Fiona trained and qualified as a solicitor with Linklaters and has over 30 years' experience (25 as a partner) of developing major infrastructure and energy projects both in the UK and in emerging markets. She has held a number of senior management and governance roles within the firm and has spend six years as its global head of diversity and inclusion. She is a lay member of the Lord Chancellor's advisory committee.
Fiona joined the Orbis UK board in December 2021.
John Ferris
Programme and Medical Advisory Committee Chair, UK
John has been a Consultant Ophthalmologist at Cheltenham General Hospital since 1999. He has a special interest in cataract surgery, squint surgery and paediatric ophthalmology. John has an international reputation in the fields of simulation and surgical training. He was the Head of the School of Ophthalmology in the Severn deanery for 10 years and succeeded Larry Benjamin as the Royal College of Ophthalmologists surgical skills faculty lead in 2019, a post he held until 2023. John has designed the Simulated Ocular Surgery and Squint Clinic websites and has written four ophthalmology textbooks, as well as numerous scientific publications. He has been an Orbis volunteer since 2018 and is a regular contributor to Cybersight webinars.
John joined the Orbis UK board in July 2023.
Mona Khan
Designated Trustee for Safeguarding, UK
Mona Khan, MD has over 25 years of clinical and surgical experience as an ophthalmologist. Her private practice was located in downtown Chicago and she was on the staff of Mercy Hospital for
over 20 years. At Mercy, she was the principal comprehensive ophthalmologist at the Mercy Family Health Clinic, a federally funded clinic whose mission was to treat the most vulnerable and socioeconomically disadvantaged residents from Chicago’s south side. She retired from clinical ophthalmology to move to London in 2020 with her husband and daughter.
In September of 2021 Mona became a trustee of Advanced Research Clusters Management Ltd (ARC). ARC owns some of Europe’s leading science and innovation clusters. Its portfolio includes Harwell, a leading science and innovation campus based in Oxfordshire.
Mona joined the Orbis UK board in December of 2021.
Sheraz Daya MD FACP FACS FRCS(Ed) FRCOphth
Sheraz Daya is an ophthalmic surgeon in practise for more than 30 years. Brought up in Tanzania, he has in the pursuit of education spent time in several countries. He trained in the United States initially under the tutelage of David Paton, the founder of Orbis. He was in practice in New York City, and later was recruited to direct and modernise the Corneoplastic Unit and Eye Bank, Queen Victoria Hospital, East Grinstead, UK. He practices at Centre for Sight an organisation he founded which has three branches. Interested in medical innovation and artificial intelligence, he co-founded a start-up company Infinite Medical Ventures in 2020. He serves on a number of industry and society advisory boards and is the next president of AECOS-Europe (American European Congress of Ophthalmic Surgery).
Sheraz joined the Orbis UK board in July 2023.
Siân Block
Siân trained as a nurse and has over 30 years’ experience in many areas of healthcare, both nationally and internationally. These include the independent sector, the NHS, the Department
of Health and Social Care, voluntary sector organisations, charities and Resuscitation Councils (UK and European).
Siân joined the Orbis UK board in June 2020.
Yvette Dunne MA FCA
Audit Committee Chair, UK
Yvette Dunne trained and qualified as a chartered accountant with PricewaterhouseCoopers. After 15 years in financial management roles in the banking and recruitment industries, Yvette spent ten years as a CFO in the not‐for‐profit sector.
Yvette joined the Orbis UK board in December 2017.
Diana Wheeler
Diana Wheeler served as SVP of Human Resources at FlightSafety International, a Berkshire Hathaway company, from 2014 to 2020. Diana also served as Corporate Counsel at FlightSafety from 1998 through 2005.
From 2006 through February 2014 and again in 2025, Diana volunteered at Orbis International. During her earlier tenure, Diana acted as General Counsel and Interim and Co-CEO. In 2025, Diana served as Interim CEO. She has been on the Orbis International Board from April 2011 to date, and serves on the Nominating and Governance, Finance, and Development Committees. Diana was elected as a Vice Chair in December 2022.
Diana and her husband, Peter Mann, divide their time between Dutchess County and New York City.
Diana joined the Orbis UK board in December 2025.
William Glaister
William is a recognised expert in aviation leasing and financing. He worked with the international law firm Clifford Chance for 32 years (22 as a partner), leading their global asset finance practice. He has worked in London, Singapore and Hong Kong. He now works as an independent consultant supporting several leasing and financing companies. He has also recently completed an MA in Early Modern History at King's College London. He is the co-editor of the forthcoming 6th edition of the Bloomsbury Professional textbook on Aircraft Financing, the royalties of which go to Orbis International.
William joined the Orbis UK board in December 2025.
Claire Porter
Claire Porter is an experienced procurement leader with over 25 years’ experience in senior roles across sectors including media, consulting, financial services and telecommunications.
She has a strong track record of helping organisations achieve sustainable, long‑term value by building capable teams and leading complex strategic initiatives.
A passionate advocate for inclusive procurement, she has extensive commercial expertise and a pragmatic, relationship‑driven approach to enhancing performance and strengthening supplier governance.
Claire joined the Orbis UK board in December 2025
