The People of Circadiance®

The Circadiance team is a collection of creative individuals who share a common devotion to making sleep and breathing better for everyone, from newborn infants to older adults. We passionately develop, manufacture and market respiratory products for people with sleep-disordered breathing, who need non-invasive ventilation or who require monitoring.

Our Team

Circadiance’s organization is comprised of individuals that each bring a unique set of skills and life experiences to the team…We find strength in our diversity. Our leadership team is no different, as the following biographies will illustrate:


    • David Groll

David Groll, Founder and CEO, has developed, manufactured and sold medical devices for over 30 years. Before starting Circadiance, David held senior management positions in several other medical device companies. David was founder and CEO of Vincent Medical, a company that performs contract manufacturing of medical devices in China, which he then sold in 2002. From 1986 to 1997 David worked for Respironics, where he ran the Patient Interface Group and was responsible for the development of the Respironics PAP masks. He completed his career there as General Manager of Respironics Hong Kong Ltd, where he was responsible for running the Asian factories that manufactures the Respironics masks. Mr. Groll holds a Bachelor of Science Degree in Biomedical Engineering from the University of Texas at Austin and a Master’s Degree in Manufacturing Systems Engineering from the University of Pittsburgh.



    • Greg Ulery

Greg Ulery, controller, has more than 25 years of experience in applying accounting best practices to manufacturing companies. He joined the Circadiance senior management team in early 2010. He worked from 2000 to 2009 for the North American branch of Swedish multinational Hoganas AB as accounting manager until his promotion in 2005 to national credit manager. Hoganas acquired FirstMiss Steel, Greg’s previous employer, where he had worked as accounting manager since 1995. He also worked for 10 years as the accounting manager and regional credit manager for a small foam manufacturer. Greg holds a B.S. in accounting from Saint Vincent College.




Board of Directors

Jeffrey is the CEO of ReGear Life Sciences, Inc., a company that develops and markets innovative products that provide deep-tissue therapeutic heating to promote pain relief, reduce joint stiffness, and facilitate the body’s natural healing process. Before joining ReGear, Jeff was the CFO at BodyMedia, a medical device company that markets its innovative calorie management system for the monitoring and treatment of metabolic disorders. Mr. Swoveland has raised more than $40 million in venture funding for medical device firms, and he holds directorships on several public and private companies. Jeff holds an M.S. in finance and policy from Carnegie Mellon University and a B.E. in geology and geophysics from the University of Missouri/Rolla.

    • Michael J. Thomas

Michael has more than 24 years of healthcare industry experience. He is the president and CEO of Appian Partners, a medical devices and healthcare services consulting firm. Earlier in his career, he was president and CEO of Sleep Solutions, a VC-backed medical device manufacturer. He helped to raise more than $50 million in VC funding for that company and launch a new industry in the $5B sleep medicine market. Michael successfully lobbied the largest Managed Care Organizations (MCOs) and the Centers for Medicare and Medicaid Services (CMS) to alter their medical policies and approve reimbursement for in-home sleep apnea diagnostic services. Before joining Sleep Solutions, he was EVP of sales and marketing for National Sleep Technologies (NST), where he led acquisitions of more than 80 sleep labs, making NST the largest sleep-testing company in the U.S. Earlier in his career, he was vice president of sales at Patient InfoSystems and instrumental in taking that company public. He began his career in sales and marketing at Merck and GlaxoWellcome. Michael graduated from Cornell University with a degree in microbiology.

    • Anthony L. Sico, D.O.

Dr. Anthony L. Sico D.O. is the Medical Director for Aetna insurance. Previously, he practiced at Indiana Regional Medical Center in Indiana, PA in the Occupational Health Services Department and Emergency Department. He is also the Medical Director of the Indiana Regional Medical Center Occupational Health Department, and is board certified in Emergency Medicine and Family Practice. Tony is a graduate of Kirksville College of Osteopathic Medicine and holds a Master’s in Public Health from the University of Wisconsin.

    • William A. Groll

Bill Groll has more than 30 years of industrial experience, primarily in the metals industry. He has been with All-Clad Metalcrafters since 1980 and has served in a variety of technical and operational roles of increasing responsibility. He currently serves as the vice president of product development for All-Clad Metalcrafters. He interacts with All-Clad’s customers and tracks market trends to create new products that serve customer needs. Bill has been awarded 18 U.S. patents with another 14 patents pending; he was named Pittsburgh’s “Inventor of the Year” in 2005 by the Pittsburgh Intellectual Property Law Association. Bill holds a B.S. in mechanical engineering from Point Park University and an Executive MBA from the University of Pittsburgh.



Technical Advisors

    • Steve Menke

Steve Menke is the CTO of Curavi Health, Inc. His role is to apply his consumer and clinical product development experience to raise the bar in post-acute care technology solutions. Curavi Health is a spin out of UPMC Enterprises and is being built on the latest in interdisciplinary clinical research in the field of telemedicine and clinical decision support. Prior to Curavi, Steve served as CIO of BodyMedia which was acquired by Jawbone in 2013. BodyMedia was a pioneer in wearable body monitors that were used in clinical, research and consumer settings. The BodyMedia platform was registered with the FDA as a Class II medical device. Steve holds a Bachelor’s Degree in Electrical Engineering from Georgia Tech, and a Master’s Degree in Computer Science from the University of Pittsburgh. He is the winner of the Pittsburgh Technology Council CIO of the year and holds multiple patents in the wearable body monitory.

    • Joe Amato

Joe Amato was formerly General Manager of Neometrics/Natus from July, 1995 until September, 2018. Neometrics is a division of Natus Medical Incorporated from 2003 onward after Natus acquired Neometrics. Joe was responsible for all facets of the business as well as day-to-day operations, managing client relationships with state government customers and delivering new products and big data. In the past 10 years Neometrics has tripled revenue with high profitability. In 2015, Neometrics started a services business for the State of California that manages follow-up activity for infants screened for hearing loss.

Prior to the acquisition by Natus, Joe was the Director of Development responsible for the development, architecture and database design for Neometrics. Neometrics has been the largest provider of newborn screening software for the metabolic and hearing markets since 1995. The Neometrics suites of software products process half of the estimated 4 million births in the United States each year. Joe is certified as an HL7 Control Specialist and has been designing, developing and producing software for 27 years. Joe has a degree in business from the University of Phoenix.



Medical Advisors

    • Andre A Muelenaer, Jr, MD, MS, FAAP, FCCP

Andre A Muelenaer, Jr, MD, MS, FAAP, FCCP, is board certified in Pediatric Pulmonology, and has practiced in this specialty for over 30 years. He serves as section chief of pediatric pulmonology and allergy at the Carilion Children’s Hospital, Roanoke, Virginia. He is Professor of Pediatrics at the Virginia Tech Carilion School of Medicine, and holds adjunct positions in the Virginia Tech Wake Forest University School of Biomedical Engineering and Sciences, and the Virginia Tech Faculty of Health Sciences. He is Visiting Associate Professor, Paediatrics/Child Health, Busitema University, Mbale, Uganda. He currently teaches part time in the Virginia Tech Department of Biomedical Engineering and Mechanics. Dr. Muelenaer is a graduate of Eastern Virginia Medical School, completed his pediatric residency at William Beaumont Army Medical Center, and received his fellowship training in pediatric pulmonology at the University of North Carolina, Chapel Hill.

Dr. Muelenaer has been interested in infant apnea throughout his medical career, establishing the apnea program and pediatric sleep lab at Duke University, followed by a large infant apnea program at Carilion Clinic. He founded Triangle Apnea Consultants, Inc., in 2002, a “store and forward” telemedicine practice that received, analyzed, and interpreted data from thousands of event recording cardiorespiratory monitors utilized to monitor infants and children in the home setting. This service permitted primary care physicians to have expert review of data, while providing decision support knowledge to optimize care for their patients.

He has an extensive background working with engineers, starting as an undergraduate at Virginia Tech. He co-founded the Pediatric Medical Device Institute (PMDI), along with Al Wicks, PhD, Department of Mechanical Engineering, Virginia Tech. PMDI is a 501 (c)(3) non-profit organization with the mission to transform needs for pediatric devices to tools at the bedside, through the FDA’s Total Product Life Cycle model. He has mentored dozens of VT engineering and life sciences undergraduates, served on graduate committees of engineering students, and research advisor for medical students and pediatric residents.

Dr. Muelenaer has served as chief medical officer for biomedical startup and early stage companies. He is a board member for local, state, national, and international non-profit health related organizations. He is a veteran of the US Army Medical Corps, with a total of 27 years of active and reserve service.