Hayes Leadership Team

Hayes’ leaders exemplify clinical and scientific excellence and embrace our commitment to serve our clients with passion and unbiased data. Clients trust our guidance, and value our consultative engagement and responsiveness in providing the answers, data, and reporting they need.

Teri Olsen Spina

Vice President, Payer Solutions

Teri Olsen Spina is Vice President of Payer Solutions. Leveraging her extensive experience in healthcare administration and educational publishing, she is responsible for…

Petra Nass, PhD

Senior Scientific Officer, Executive Director Evidence Solutions

Dr. Nass is responsible for ensuring the scientific and methodological quality of the Hayes evidence products…

David Zieve, MD, MHA

Medical Director, Hayes

As Medical Director at Hayes, David Zieve works closely with the Evidence Solutions analysts and provides clinical oversight for a variety of client solutions…

Michelle Ostrander, PhD

Scientific Director, Evidence Analysis

As Scientific Director, Dr. Ostrander has oversight of the development and editorial review of health technology assessments and comparative effectiveness…

Shannon Brode, MPH

Scientific Director, Evidence Analysis

Shannon Brode co-leads a team of analysts charged with writing methodologically rigorous health technology assessments on new and emerging health technologies…

Renee Balliet, PhD, MBA

Scientific Director, Precision Medicine

Dr. Renee Balliet is responsible for the rapidly expanding product line of Precision Medicine. This includes critical content clients need when managing genetic and…

Beth Bontemps, MS

Scientific Director, Horizon Scanning

Beth Bontemps employs her clinical and research expertise as she monitors new, emerging, and controversial technologies. Her efforts are critical to provider and payer clients…

Meredith Calloway, MS, PMP

Associate Scientific Director

Meredith Calloway specializes in Health Technology Assessment (HTAs) and systematic reviews. A certified project manager, she oversees contract and custom work for clients…

Teri Spina

Vice President, Payer Solutions

Teri Olsen Spina is Vice President of Payer Solutions. Leveraging her extensive experience in healthcare administration and educational publishing, she is responsible for daily operations and annual growth.

Before joining TractManager, Ms. Olsen Spina’s entrepreneurial, operational and business development skills have helped to improve the capacity and success of nonprofits, start-ups and established corporations. She is a published author and the founder and visionary behind a highly successful peer-review management business called M2ims. The company evolved into a powerful research technology used by major educational publishers and institutions such as Pearson, Wolters Kluwer, McGraw Hill, the Archdiocese of Chicago Schools and more.

Ms. Olsen Spina earned with honors a BS in Marketing and Management degree from Siena College. She won the Wall Street Journal Academic Achievement Award from CUNY, is the Founder of M2ims, a Former Partner in PubCentral, and is the author of “The Personal Health Diary” (c 2001 Delmar Thomson Publishing).

Petra Nass, PhD

Senior Scientific Officer, Executive Director Evidence Solutions

Dr. Nass is responsible for ensuring the scientific and methodological quality of the Hayes evidence products. In previous roles at Hayes, she managed the Hayes Medical Technology Directory and led custom projects for key clients. She has written and edited over 100 health technology assessments or comparative effectiveness reviews.

Prior to joining Hayes, Dr. Nass was a faculty member at the Johns Hopkins University and a postdoctoral fellow at the Food and Drug Administration. She developed plasmid vectors for gene therapy for herpes simplex virus and wound healing, and supported projects on molecular markers in esophageal cancer.

Dr. Nass has a broad understanding of research strategies and methods encompassing the natural and social sciences. Continuing education and certification in public policy and management (University of York, York, United Kingdom), cross-cultural training and management (Heidelberg University of Education, Heidelberg, Germany), systemic and integrative therapy (Psynapse School of Psychotherapy, Paris, France), and computational genomics and executive data science (Johns Hopkins University, Baltimore, USA) complement her professional experience.

David Zieve, MD, MHA

Medical Director, Hayes

As Medical Director at Hayes, David Zieve works closely with the Evidence Solutions analysts and provides clinical oversight for a variety of client solutions, including collaborations with Hayes’ key clients.

Prior to joining Hayes, Dr. Zieve served in various medical director positions, most recently as Senior Medical Director of Health Integrated, where his role encompassed utilization management, appeals management, case management oversight, and medical policy. He also worked as a Physician Editor for Milliman Care Guidelines (now MCG), where he wrote and edited evidence-based clinical care guidelines, including coverage of emerging technology and pharmaceuticals, and worked with analysts to create utilization benchmarks.

Dr. Zieve also worked as Medical Director for A.D.A.M. Health, provider of patient education content; as a Physician Adviser with the Health Information Institute; and as Vice President and Medical Director, Quality and Utilization Management, and Clinic Medical Director at Medalia Healthcare/Providence Health System.

Dr. Zieve earned his Doctor of Medicine degree from the Medical College of Ohio (now the University of Toledo Medical School) and completed his Family Practice Residency at the University of Wisconsin, Madison. He is Board Certified by the American Board of Family Medicine and holds a Master of Health Administration degree from the University of Washington.

Michelle Ostrander, PhD

Scientific Director, Evidence Analysis

As Scientific Director, Dr. Ostrander has oversight of the development and editorial review of health technology assessments and comparative effectiveness reviews and provides guidance to the scientific analyst team. Dr. Ostrander has written and edited over 200 health technology assessments or comparative effectiveness reviews. She has over 15 years of experience in the healthcare field, including evidence evaluation, analysis, and synthesis; leadership and management; scientific/medical writing and editing; development and presentation of skills training and professional education programs; systematic searches of medical literature, evidence-based medicine, and regulatory databases; and preclinical and secondary research. She has developed and presented numerous educational programs for Hayes staff and clients.

Prior to joining Hayes, Dr. Ostrander served as a medical program manager at a continuing medical education (CME) company and completed a postdoctoral fellowship at the University of Cincinnati. She received research service award grants from the National Institutes of Health that supported her graduate and postgraduate work. She has nearly twenty publications in peer-reviewed scientific journals as well as chapters, abstracts, and oral presentations at scientific conferences. Dr. Ostrander earned a PhD in Neuroscience from the University of Michigan in Ann Arbor and her BS in Psychology at the Ohio State University.

Shannon Brode, MPH

Scientific Director, Evidence Analysis

Shannon Brode co-leads a team of analysts charged with writing methodologically rigorous health technology assessments on new and emerging health technologies, devices, and procedures. She oversees and reviews the scientific and methodological rigor of the Hayes Health Technology Assessments and Annual Reviews.

Ms. Brode brings 10 years of experience in healthcare including scientific writing and editing of health technology assessments; evidence evaluation, analysis, and synthesis; leadership and management of analyst teams; leading knowledge transfer efforts; and managing clinical research.

Prior to joining Hayes, Ms. Brode worked for the Agency for Healthcare Research and Quality (AHRQ) through the Research Triangle Institute-University of North Carolina at Chapel Hill Evidence-Based Practice Center.

Ms. Brode earned a Bachelor of Arts in Anthropology from Northern Arizona University and obtained her MPH with a focus on creating and evaluating a training tool for internal medicine residents of West Virginia University’s School of Medicine. The training module that she created and evaluated was used in the Internal Medicine curriculum to educate students on screening techniques for intimate partner violence. Ms. Brode also earned a certificate in Women’s Health during her tenure at West Virginia University.

Renee Balliet, PhD, MBA

Scientific Director, Precision Medicine

Dr. Renee Balliet is responsible for the rapidly expanding product line of Precision Medicine. This includes critical content clients need when managing genetic and molecular medicine. Her responsibilities include innovation, strategic planning, market evaluation, product enhancements, team management, and ensuring scientific and clinical quality and integrity.

Dr. Balliet has over 15 years of experience in the field of genetics and precision medicine, including evidence evaluation, analysis, and synthesis; consulting; business development; scientific/medical project management; development, presentation, and marketing of scientific information; and preclinical research. In addition, she is skilled in conducting systematic searches of medical literature, genetic databases, and regulatory databases, resulting in over 100 technology assessments.

Prior to joining Hayes, Dr. Balliet was a Program Administrator for the American Association for Cancer Research (AACR). During her time at AACR, her responsibilities included scientific review of grants and promotional materials, and managing relations between grantees and funders. Dr. Balliet also served as a faculty member at Thomas Jefferson University, where she had authored and co-authored numerous papers in the fields of pharmacogenetics and oncology.

Dr. Balliet earned her BS in Biology from Moravian College and both her PhD in Genetics and her MBA from Pennsylvania State University. 

Beth Bontemps, MS

Scientific Director, Horizon Scanning

Beth Bontemps employs her clinical and research expertise as she monitors new, emerging, and controversial technologies. Her efforts are critical to provider and payer clients as they plan for the clinical and financial impact a technology may have on their populations.

Ms. Bontemps’ work is critical as the Hayes team considers topics and builds a product roadmap that will continue to enable client success. In addition, she is responsible for the Hayes News, which provides clients with daily email updates from trusted healthcare sources such as the CDC, NIH. and FDA. She also manages custom reports for Hayes clients.

Prior to joining Hayes, Ms. Bontemps served as a clinical and reimbursement consultant for JR Associates Inc., a medical technology reimbursement consulting firm. Her clinical experience in nursing encompasses critical care, emergency medicine, interventional cardiology, orthopedics, women’s health, and primary care.

Ms. Bontemps holds a Master of Science (Nurse Practitioner) from the University of Colorado and a Bachelor of Science in Nursing from Thomas Jefferson University. She has been certified as a Certified Coding Specialist (CCS) by the American Health Information Management Association (AHIMA).

Meredith Calloway, MS, PMP

Associate Scientific Director

Meredith Calloway specializes in Health Technology Assessment (HTAs) and systematic reviews. A certified project manager, she oversees contract and custom work for clients including government agencies, and is the project manager for the MedInsight Hayes Grouper, a new decision-making technology that integrates Hayes’ evidence-based measures with Milliman’s industry-leading claims analytics. In addition, Ms. Calloway is the lead clinical evidence scientist for the TractManager Provider Evidence Solution. This is a key role in the integration of clinical and technical evidence providers need to make the best evidence-based decisions.

Ms. Calloway earned an Honors BS with Distinction at the University of Delaware. She majored in animal science with a minor in psychology, and earned a MS in biological sciences from Auburn University.