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Unlocking overall health through complete digestive care

about cylinder meet the team

It's time for GI issues to get the attention they deserve

The financial and emotional toll of dealing with gastrointestinal issues has been overlooked and understated.

We’re devoted to delivering a better, more effective experience for all digestive issues.

It starts with knowing digestive health is at the center of overall health.

And looking beyond the gut to solve what’s happening within it.

Meet the team shaping the future of GI care


cylinder team bill snyder ceo
Chief Executive Officer

Bill Snyder

About Bill
As Cylinder’s CEO, Bill works with Fortune 500 companies and national health plans across the U.S. to reduce GI-related health care costs, which total $136B per year. Before joining Cylinder, he led commercial and health plan partnerships at Virta Health and spent over a decade in leadership roles at Humana, where he oversaw its $500M IL market.


  • Northwestern University, Kellogg School of Management
  • Vanderbilt University

Why Cylinder?
We have an incredible team of thoughtful people working together to help people who suffer from serious chronic conditions. As the thought leaders in digestive health, we can bring our members the care, education, and guidance they seek.

Claim to fame
I’m most proud of my loving and caring family—my wife, Gudrun, our daughter Sunna, and our son Jack.

cylinder team katharine moore
Chief of Staff &
Senior Vice President of People

Katharine Moore

About Katharine
In her role at Cylinder, Katharine manages people operations, culture initiatives, and projects that drive the business forward. She has over 15 years of sales, account management, and startup experience, including two years as Director of Business Development at Zocdoc.


  • University of Michigan

Why Cylinder?
Everyone engages with the health care industry, and there is much room for improvement in the patient experience. Cylinder has an incredible opportunity to drive awareness and effectively support digestive health issues. The timing is right, as people realize how important and connected digestive health is to overall health and quality of life.

Claim to fame
I have traveled to over 40 countries and try to visit at least one new country every year, though I love returning to Japan.

cylinder team hau liu
Chief Medical Officer

Hau Liu, MD, MBA, MPH

About Hau Liu
Dr. Liu has over 20 years of health care experience, including leadership roles in clinical medicine, digital health, chronic condition management, and health care operations. Before joining Cylinder, he was Senior Vice President of Clinical Strategy at Teladoc Health, Chief Medical Officer at the Shanghai hospitals of United Family Healthcare, and Director of the Chronic Care Management Division at Santa Clara Valley Medical Center. Dr. Liu is a practicing physician on the NYU Grossman School of Medicine faculty. He previously served on the faculty at Stanford University School of Medicine and as a fellow at the Center for Primary Care and Outcomes Research.


  • AB, Harvard College
  • MD, MBA, MPH, Columbia University
  • MS, Stanford University
  • Residency and Fellowship, Stanford Medicine

Why Cylinder?
I’m excited to advance the field in an incredibly important and often stigmatized area of health care. I appreciate Cylinder’s mission-driven, member-centric focus. Gastrointestinal disorders also affect my family, and I see the need and opportunity to transform the way that digestive care is delivered.

Claim to fame
I’m passionate about two Rs: Running and Reading. For running, nothing beats a good run through Central Park or along the Bund. For reading, I recommend anything by Adam Grant (Give and Take) or Tim Keller (Every Good Endeavor).

cylinder team dan anolik
Chief Technology Officer

Dan Anolik

About Dan
Dan has over 25 years of software experience. Before joining Cylinder, he was Vice President of Engineering at Cambia Health Solutions, leading the tech teams behind HealthSparq and Journi.

Before working in health care, Dan co-founded and worked with tech startups in flight planning, software risk management, hedge fund administration, and cloud computing automation. He was also a solutions architect at Boeing, leading the innovation and development of flight planning systems for commercial airlines and navigation systems for pilots.

Why Cylinder?
I’ve always been passionate about building practical solutions to real-world problems. Digestive health issues impact most of my family. So, when I met the great team at Cylinder and heard their plan to use innovative technology to revolutionize gut health, I knew I had to join the mission.

Claim to fame
I play the mandolin in an upbeat bluegrass band. I’ve also spent almost 15 years in volunteer search and rescue in Oregon’s Mt. Hood wilderness area.

cylinder team chris nordman
Senior Vice President of Commercial

Chris Nordman

About Chris:
Chris has nearly a decade of experience building and growing commercial organizations in traditional and digital health care. Before joining Cylinder, he worked with health tech innovators, including Omada Health and Galileo, to improve patient access and reduce medical spending.


  • University of California, Davis

Why Cylinder?
I’ve suffered with GI issues on and off my entire life—rotating through medications, devouring Rolaids, and giving up hope on permanent relief. I learned about Cylinder shortly after an expensive abdominal ultrasound and endoscopy. It felt like the stars had aligned to create an opportunity for personal health improvements while sharing Cylinder with the world.

cylinder team karen luk
Chief Product Officer

Karen Luk

About Karen:
With over 20 years of product management experience, Karen has focused on health care products and services for nearly a decade. Before joining Cylinder, her work focused on mental health, driving the member experience as Vice President of Product at AbleTo. Karen has held product leadership roles across several health tech companies focused on electronic health records, patient engagement, care management software, and COVID-19 response in public health.


  • University of Waterloo, Ontario

Why Cylinder?
Building products and services that meaningfully impact people’s lives excites me, and that’s what we do at Cylinder. Digestive health has personally affected my family, which makes the mission and the opportunity to make a difference even more important to me.

Claim to fame
I’ve climbed Mt. Kilimanjaro.

cylinder team achint prabhat
Vice President of Finance

Achint Prabhat

About Achint:
Achint brings over 20 years of experience managing financial operations at venture-backed startups and growth-stage companies. Before joining Cylinder, he led finance at DAIS Technology and strategy and economics at Uptake.


  • University of Illinois Urbana-Champaign
  • Delhi College of Engineering

Why Cylinder?
I was drawn to the tremendous team and care-based, compassionate approach to solving a major health issue.

Claim to fame
I’m most proud of my wife and kids; spending time with them is where most of my spare time goes!

Advisors at the forefront of GI health and care

Board of Directors

Our accomplished board of directors includes notable health care and technology leaders. Working with the Cylinder leadership team, they help the company scale to meet the growing need for gut health and digestive disease solutions among employees, employers, and health plans, with a focus on reducing costs and improving outcomes for all.

Robert Garber

Robert is a Partner at 7wireVentures, focused on investments in digital health companies that empower consumers to be better stewards of their health in today’s changing health ecosystem. He is a board member of Cylinder, RecoveryOne, SameSky Health, and HomeThrive. He is also Chairman of the Board of Directors at HealthBeacon and a board advisor for HealthXL.

Robert has over 30 years of experience investing in, advising, and operating early-stage health care and tech companies. He has co-managed four venture funds with $400M+ AUM. Before joining 7wireVentures, Robert led health care and technology investments as Managing Director at Stratus Ventures and KB Partners.


  • Kellogg Graduate School of Management, Northwestern University
  • University of Pennsylvania

Joe Kaiser

Joe is a growth-stage investor and Managing Director at Mercato, where he leverages his two-plus decades of operating and investing experience. He advises and supports Midwestern entrepreneurs who have built unique growth engines and are ready to scale. He sits on the board of directors at Cylinder, Attain, Beam Benefits, Kalderos, MNTN, and Summersalt.

Joe started his career in investment banking at A.G. Edwards & Sons, Inc., followed by the private equity firm Erie Management Group where he evaluated, structured, and managed growth-stage investments. After obtaining an MBA, Joe joined The Blackstone Group, advising investors and corporate clients, managing mergers and acquisitions, and structuring financial transactions. As Director of Capital Markets at Vivint Solar, Joe guided the company to its $1.6B IPO in 2014 and $3.2B sale in 2020. During his time at Vivint, he raised more than $1B in project financing to facilitate the deployment of residential and commercial solar assets.


  • Kellogg School of Management, Northwestern University
  • Saint Louis University

Rachel Pacheco, PhD

Rachel is a former Chief People Officer, advisor, author, and current faculty member at the Wharton School of Business, where she teaches global strategy and organizational behavior. Her work includes ongoing research on management, specifically about power and culture. Rachel’s first book, Bringing Up the Boss: Practical Lessons for New Managers, provides practical tools for new managers in start-up organizations.

Over the past decade, Rachel has served on health care and big data startup executive teams. As an advisor on organizational design, team dynamics, talent strategies, and building a healthy culture, she has supported numerous digital health care startups, including Maven Clinic, Wellthy, Cityblock Health, and Included Health. Rachel was a founding faculty member of the Entrepreneurship in Education Program at the University of Pennsylvania.


  • PhD, MBA, Wharton School of Business, University of Pennsylvania
  • Georgetown University

Bill Snyder

As Cylinder’s CEO, Bill works with Fortune 500 companies and national health plans across the U.S. to reduce GI-related health care costs, which total $136B per year. Before joining Cylinder, he led commercial and health plan partnerships at Virta Health and spent over a decade in leadership roles at Humana, where he oversaw its $500M IL market.


  • Northwestern University, Kellogg School of Management
  • Vanderbilt University

Sally Welborn

With over 30 years of experience in payer and employer solutions, Sally advises health care organizations and entrepreneurs in health care and employee benefits. Most recently, she served as Senior Vice President of Global Benefits at Walmart Stores, Inc. Before that, she was Senior Vice President of Corporate Benefits for Wells Fargo & Co. She is a member of the board of directors for Cylinder, Truveris, Inc., and the Leapfrog Group. She is also a Board Advisor at the Penn Center for Health Incentives and Behavioral Economics.


  • The University of Texas at Arlington

Commercial Advisory Board

Cylinder’s commercial advisory board includes distinguished health care and technology leaders. Working with the Cylinder leadership team, our advisors provide expert knowledge and guidance on market conditions, sales best practices, and marketing strategies.

Jonathan Fox

Jonathan is Managing Director for the Marwood Group, a leading advisory and research company in health care services. He is also the Managing Director of US Imaging, a Marwood subsidiary and member engagement concierge program for advanced imaging. In addition, he is a strategic advisor to health care management teams, where his experience equips him with a broad view of the market, including health care benefits. His relationships with health care thought leaders across corporate, labor, municipal, health plan, third-party administrator, and benefits consultants provide great insight into the health care market.


  • The University of North Carolina at Chapel Hill

Jason Parrott

Jason has over 25 years of enterprise health and welfare experience with leading employers, including Vida Health, AT&T, and Boeing. He served as Board Chair for the Midwest Business Group on Health in Chicago and works with the Employer Health Innovation Round Table. Jason supports Cylinder with his knowledge of the GI and digestive health marketplace.


  • Benedictine University
  • Illinois State University

Joe Toniolo

Joe is a human resources professional with over 20 years of leadership experience in all aspects of benefits. Currently serving as US Foods’ Senior Director of Health & Welfare Plans, he is responsible for the company’s benefits strategy, plans, programs, and activities. Before US Foods, he led benefits at Sears Holding Company.


  • Dominican University
  • Northern Illinois University

Clinical Advisory Board

Our clinical advisory board includes experts from the GI and population health fields committed to advancing digestive health care. We are proud to work with these prominent individuals to help review our clinical protocols and approach.

Miguel Barbosa, Ph.D.

Dr. Barbosa has over 20 years of experience leading drug discovery and development programs at major pharmaceutical and biotechnology companies. He has held roles as the Chief Scientific Officer, Microbiome, at Assembly Biosciences, and Global Head, Vice President of Immunology Research & External Innovation for Janssen Research & Development, where he oversaw immunology research and development and new program initiatives, including Johnson & Johnson’s new microbiome enterprise. Previous roles included new drug research and development programs at prominent biopharmaceutical firms, including Centocor, Signal Pharmaceuticals, TRL USA, Chugai Biopharma, and Mirna Technologies.


  • Post-doctoral fellowship, National Cancer Institute
  • PhD, Microbiology & Immunology, University of California, Los Angeles
  • BS, Genetics, University of California, Davis

Dena M. Bravata, MD, MS

Dr. Bravata is a health care entrepreneur, executive, and nationally recognized health services researcher. She is the co-founder of Lyra Health and a founding member of the Aspen Institute Healthcare Strategy Group.

Previously, Dr. Bravata was the founding Chief Medical Officer and Head of Products at Castlight Health. She was also a practicing internist for 16 years and an attending physician at Stanford University and the Palo Alto VA. In 2021, Dr. Bravata received a national service award from the White House and CDC for her work on the pandemic response and


  • MS, Stanford University
  • Residency, Stanford University
  • MD, Columbia University
  • University of Oxford
  • Yale University

Joel Brill, MD

Dr. Brill is an executive clinician with over 30 years of experience providing strategic leadership and medical oversight to data-driven health organizations, skilled in strategy, development, and implementation of innovative value-driven health programs, products, and payment systems, with extensive experience in clinical practice, research, coverage, reimbursement, quality improvement, observational registries, and bundled and episode payments.

Board Certified in Internal Medicine and Gastroenterology, Dr. Brill has run risk-bearing Independent Practice Associations and Physician-Hospital Organizations in California and Arizona. He has held management positions and serves on Scientific / Editorial Advisory Boards / Committees for several managed care companies and journals. He has authored over 150 CPT code applications, participates in the CPT Editorial Panel and the RBRVS Update Committee, and co-chaired the Part D medication measures Technical Expert Panel for CMS.

Dr. Brill is the lead physician for the American Gastroenterological Association (AGA) Bundled Payment Project, an author of several guidelines / quality measures in Gastroenterology and Preventive Services, and the co-founder of the AGA Center for GI Innovation and Technology.


  • AB, Biology, University of California, Los Angeles
  • PhD, Rosalind Franklin University of Medicine and Science, Chicago Medical School
  • Internship & Residency, Internal Medicine, UCLA – San Fernando Valley Program
  • Fellowship, Gastroenterology, Los Angeles County – USC Medical Center
  • Management Program for Health Care Organizations, UCLA School of Public Health

Chin Hur, MD, MPH

Dr. Hur is the Herbert and Florence Irving Professor of Medicine and Epidemiology and the Director of Healthcare Innovations and Research at Columbia University Medical Center. He is a nationally recognized expert in cancer screening and the prevention of gastrointestinal cancers and a leader within the National Cancer Institute consortium of researchers working to improve cancer management.

His research focuses on esophageal, gastric, and pancreatic disease and the use of data analytics and advanced machine learning to develop clinical prediction rules.


  • MD, The Johns Hopkins University School of Medicine
  • MPH, The Johns Hopkins School of Public Health

Hamed Khalili, MD

Dr. Khalili is an esteemed gastroenterologist and Director of Clinical Research at Massachusetts General Hospital, Crohn’s and Colitis Center. He is an Associate Professor at Harvard Medical School. His research focuses on studying dietary and lifestyle factors and their relationship to the development and progression of inflammatory bowel diseases.

Dr. Khalili has published over 150 peer-reviewed original papers and has received funding from the National Institute of Health, the Crohn’s and Colitis Foundation, the American Gastroenterological Association, and the American College of Gastroenterology.


  • Fellowship, Massachusetts General Hospital
  • MPH, Harvard T.H. Chan School of Public Health
  • MD, UT Southwestern Medical Center

Uri Ladabaum, MD, MS

Dr. Ladabaum is a Professor of Medicine in Gastroenterology and Hepatology, and the Director of the Gastrointestinal Cancer Prevention Program at Stanford University Medical Center.

Dr. Ladabaum is a nationally recognized expert in colorectal cancer screening, including evaluation of the economic impact and cost-effectiveness of screening strategies. His research program spans a range of methods and approaches, including epidemiological studies, observational and interventional clinical studies, decision analyses, and systematic reviews.


  • Fellowship, University of Michigan
  • Residency, Stanford University Hospital
  • A.B., University of California, Berkeley
  • M.D., University of California, San Francisco
  • M.S., University of Michigan

Mark Pimentel, MD

Dr. Pimentel is a leading expert in developing diagnostic and therapeutic programs for small intestinal bacterial overgrowth (SIBO), Irritable Bowel Syndrome (IBS), and other diseases linked to the microbiome.

Dr. Pimentel is an Associate Professor of Medicine and Gastroenterology, and Executive Director of the Medically Associated Science and Technology (MAST) program at Cedars-Sinai. He is credited for developing the first blood test for IBS, discovering rifaximin for the treatment of IBS-D, identifying the auto-immune basis for IBS/SIBO, and developing the first multi-gas breath test for SIBO.


  • MD, University of Manitoba
  • Internship, University of Manitoba
  • Residency and Fellowship, University of Manitoba

Research and Publications

A compilation of leading research from Cylinder staff and our Clinical Advisory Board members


Cylinder in the news

July 16, 2024 in News

Nearly 75% of Americans experience digestive distress, hurting productivity and morale

Cylinder CEO Bill Snyder explains how GI issues appear in medical claims and offers strategies for benefits professionals to alleviate their impact on employees.
Read More
July 10, 2024 in Press release

Cylinder State of Gut Health in the Workplace survey reveals millions of American workers suffer through GI issues in silence

Survey conducted by The Harris Poll on behalf of employee benefits provider Cylinder finds social stigma and reduced workplace productivity for those who experience GI issues
Read More
June 18, 2024 in News

Vivante rebrands to Cylinder

Cylinder CEO Bill Snyder explains how GI issues appear in medical claims and offers strategies for benefits professionals to alleviate their impact on employees.
Read More

Interested in joining Cylinder?

We’re always looking for people who share our passion for bringing better digestive health to the world.

See open roles