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…

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…

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…