Meet the people behind Dr. B

Our mission is to make healthcare access more efficient and equitable.

The Team

Cyrus Massoumi
Cyrus MassoumiFounder
Dr. B is the brainchild of Cyrus Massoumi, an entrepreneur and investor whose mission to make access to healthcare more efficient and equitable. Cyrus is the founder and former CEO of ZocDoc and member of the Board of Advisors of Columbia University's Mailman School of Public Health. Cyrus is also the founder of humbition, a venture capital firm, and Shadow, the app that uses AI and the power of community to reunite lost pets with their families.
Dr. Bobby Buka
Dr. Bobby BukaHead of Strategy
With his focus on patient-centric treatment plans, Dr. Bobby Buka is one of New York’s leading dermatologists. He is the co-founder of The Dermatology Specialists, a full-service practice with 20+ locations across New York City. Dr. Buka graduated from the Feinberg School of Medicine at Northwestern University and completed his residency at the University of California San Diego. He is affiliated with Mount Sinai Hospital and a member of the American Academy of Dermatology.
Misha Kaletsky
Misha KaletskyHead of Technology
Misha Kaletsky is a software engineering leader specializing in using technology to solve complex problems in healthcare. Prior to joining the Dr. B team, Misha held positions at Haven, ZocDoc, and Microsoft. He received a B.Sc. in Mathematics from Oxford University and a M.Sc. in Computer Science from University College London.
Ahmet Nalcacioglu
Ahmet NalcaciogluPrincipal Engineer
Ahmet Nalcacioglu is an experienced software engineer. Prior to joining Dr. B., he worked as a Principal Engineer at Haven, a healthcare startup. Before that, he built and ran a quantitative/systematic trading hedge fund. Ahmet received his MBA degree from New York University, MS degree in Computer Science from the University of Florida, and his B.Sc. in Computer Science from Bilkent University, Turkey.
Jimmy Chion
Jimmy ChionHead of Consumer Product
Jimmy co-founded the site, also a COVID standby list, and merged forces with Dr. B in February to accelerate the shared mission. He was previously a Creative Technologist at the New York Times and Principal Designer at IDEO. Jimmy holds a BA in Psychology and MS in Mechanical Engineering, both from Stanford University.
Clara Bensen
Clara BensenHead of Brand
Clara Bensen is an experienced content strategist who has supported 100+ funds and startups across a range of industries. She is the founder of Far West, a leading digital creative studio. She is also a published author, with a travel memoir (No Baggage), which has been published in a dozen languages and optioned for a feature film by Warner Brothers.
Ariel Farias
Ariel FariasSoftware Engineer
Ariel Farias is an experienced software engineer with years of experience building responsive and reliable solutions for clients across a range of industries. Before joining Dr. B, Ariel worked with Ultimate Software/UKG Inc., Ampled, and ChordBuff, which he co-founded. He holds a BS in Computer Engineering from the University of Florida.

Medical Advisors

Ian Lipkin
Dr. Lipkin is an internationally recognized expert in pathogen discovery with over 30 years in diagnostics, microbial discovery, and outbreak response. In 2020, Dr. Lipkin created the C3 test, an ultra-sensitive COVID-19 test that can detect and quantify even low viral loads. Dr. Lipkin was in China studying the coronavirus outbreak while it was happening.
Akili Hinson
Dr. Akili Hinson, MD is a general surgery specialist in NY and is the founder and CEO of Juno Medical. An entrepreneur, physician, and healthcare innovation expert, Akili holds a Bachelor of Art Degree in Economics from Georgetown University, a Doctor of Medicine from Weill Medical College of Cornell University, and a MBA in Finance and Healthcare Management from Columbia Business School.
Florian Otto
An entrepreneur and former physician, Florian Otto is the founder and CEO of Cedar, the healthcare financial platform. Prior to founding Cedar, Florian was an executive at ZocDoc. He holds an M.D., D.D.S. and PhD from the University of Freiburg, Germany.
Robin Berzin
Dr. Robin Berzin is the founder and CEO of Parsley Health, the national medical service closing the gap in the health care system for people with chronic illness through holistic care that drives better outcomes. A Summa Cum Laude graduate of the University of Pennsylvania, Robin completed medical school at Columbia University’s College of Physicians and Surgeons and trained in Internal Medicine at Mount Sinai Hospital in New York City.
Tom Lee
Tom Lee is a Harvard-trained internist and pioneering innovator in health care tech. Tom founded One Medical, the national leader in tech-enabled primary care. Tom also founded Galileo Health, a service re-imagining the relationship between patient and doctor, and Epocrates, the breakthrough medical reference app.
Toyin Ajayi
Dr. Toyin Ajayi is Co-Founder and Chief Health Officer of Cityblock Health. Previously, she was Chief Medical Officer of Commonwealth Care Alliance, an integrated health plan and care-delivery system for individuals dually eligible for Medicare and Medicaid. Toyin holds degrees from Stanford University (BA, Human Biology) and the University of Cambridge (MPhil, Development Economics and International Development). She received her MD from King’s College London School of Medicine, is a board-certified Family Physician, and continues to practice primary care and hospital medicine.


Doug Hirsh
Doug Hirsch is a veteran technology entrepreneur well-versed in social media, healthcare, and entertainment web and mobile products. Doug’s broad experience includes working as one of the first 30 employees at Yahoo!, serving as the Vice President of Product at Facebook, and founding DailyStrength, the web’s largest community for people facing health and life challenges. He is the Founder and CEO of GoodRx, a company helping Americans get the healthcare they need at a price they can afford.
Leigh Shapiro
Leigh Shapiro is the Head of Product & Operations at Shadow. She previously served as the Executive Director of Sector-based Workforce Development Training, in New York City’s Department of Small Business Services.
Lulu Cheng Meservey
Lulu Cheng Meservey’s background spans tech, finance, consulting and international relations. She is the Co-founder and President at the communications firm TrailRunner International and previously held roles at The World Bank, JPMorgan, and MIT Lincoln Laboratory. Lulu holds degrees from Yale University (BA, Political Science) and the Fletcher School at Tufts University (Masters, International Affairs).
Luke Bonney
Luke Bonney has more than a decade of experience working at the intersection of healthcare and technology. He is the Founder and CEO of Redox, which connects vendors and providers organizations to exchange healthcare data. He previously held roles at Epic and SilverKey Technologies. Luke holds a BS in Neuroscience and Behavior and Business from Cornell University.
Matthew Ng
Matthew Ng is a seasoned software engineer, currently holding the position of Head of Technology at Shadow. Prior, Matthew worked at Wildcard, Canary, and BlackRock. He holds a BS, Management and Computer Science and a MS in Computer Science from the Massachusetts Institute of Technology.
Travis Schmeisser
Travis Schmeisser is an expert in product design, founding companies such as Structure and First Principle, LLC and holding executive positions at Square and Flight Labs, amongst others.