Our Team

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Lorin Gresser

Chief Executive Officer

Steve Varley

Chief Technology Officer

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Dr. Mariane Melo

Chief Medical Officer

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Dr. Camilo Brandao-De-Resende

Machine Learning Scientist

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Chris Phillips

Lead Full-stack Developer

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Jovin D'Costa

TesT Manager

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Sean Cregg

Clinical Relations Ambassador

Ilya Ilin

Full-stack Developer

Kauser Hussain

Director of Business Development

Our Team

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Lorin Gresser

Chief Executive Officer
Lorin founded Dem Dx in 2015 after graduating from medical school and has been the CEO of Dem Dx ever since. As well as her medical degree from King's College London she has a MA in Natural Sciences from Cambridge University and an MBA from Harvard University.
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Steve Varley

Chief Technology Officer
Steve started developing software from an early age of 16, writing machine code algorithms for home computers to extend the core functionality and provide such things as high-resolution screen dumps. He now has over 35 years experience in open systems software architecture, design, and development, including 10+ years in mobile app development. Steve holds a BA in Computing Science from Teesside University. He is passionate about building great tech teams where people love to work.
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Michael Steel

Director
Following a successful career in strategy consulting, Michael founded Greenbrook Healthcare in 2006 and grew it to become the largest provider of NHS urgent treatment centres in the country. In 2019, the Greenbrook business was successfully sold to Totally plc with £40m+ turnover, 700+ staff and a reputation for high quality and safe service provision. Michael holds an MBA from INSEAD and an MPhil. in Economics from Oxford University.
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Dr Sally Johnson

Director
Sally is a practicing GP with 30 years experience in the NHS. Alongside her clinical roles she has worked as the Chief Medical Officer of NHS and International Private primary and urgent care organisations. She has expertise in developing and delivering high quality, innovative and safe services. Her interests include pathway innovation, clinical governance, telemedicine, regulatory compliance and workforce development. As well as supporting Dem Dx Sally is a practicing GP, CQC inspector and Medical Examiner.
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Dr Mariane Melo

Chief Medical Officer
Mariane founded the first spin-off of her university and several awards including competitions in Finland and MIT. She holds an MBBS, Federal University of Minas Gerais Brazil and King's College London, UK.
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James McAllister

Lead Full Stack Developer
James has over 20 years experience as a web developer across multiple industries. Until recently, he shared this experience as a teacher at Constructor Labs on their JavaScript Coding Bootcamps.
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Dr Camilo Brandão-de-Resende

Artificial Intelligence Specialist
Camilo is a qualified Physician (Ophthalmologist, PhD), engineer and a specialist (MSc) with 10+ years of experience in applications of statistical learning and artificial intelligence in industry and academia. He has been a researcher at the Aeronautical Institute of Technology and the Federal University of Minas Gerais, Brazil, and Carnegie Mellon University, USA.
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Chris Phillips

Full-stack developer
Chris is a full-stack programmer at Dem Dx. He holds a BSc in Business and in a former career was a producer with 10+ year career in the media industry.
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Jovin D'Costa

Test Manager & Project Manager
Jovin has 14+ years of experience with over 4 years of project and application delivery prior to joining Dem Dx. Jovin also has a BSc in Computer Systems and a PGDiploma in Network Systems Engineering from the University of Plymouth.
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Sean Cregg

Clinical Relations Ambassador
Sean has 10 years experience in nursing. He has worked in cardiac and acute care, forensic nursing and also as an NMC Competence Assessor before joining DemDx. He brings clinical experience to support platform users and to develop and maintain relationships with front line clinicians.
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Ilya Ilin

Full-stack Developer
Ilya started developing Web applications with Rich Internet Applications in 2007. In 2010 he was working on mobile apps. In 2016 he became a full-stack developer. He loves writing code and is particularly keen on automated testing.