At Nomax, our leadership team is composed of exceptional individuals who bring a wealth of experience, expertise, and passion to guide our company towards success. Nomax was co-founded by Charles Voellinger Sr., and is now led by Charles Voellinger Jr., our President. Our dedicated leadership team is committed to driving innovation, delivering quality products, and fostering a collaborative and fulfilling work environment. Get to know our accomplished leaders and their remarkable contributions to Nomax’s journey of growth and excellence.
Meet the Leadership Team at Nomax Inc.
Charles Voellinger, Jr
President of Nomax
Charles Voellinger has helped lead Nomax since 2011. After completing his undergraduate degree at Cornell University in Industrial Engineering and Operations Research and a M.S. of Engineering and a MBA from Northwestern University, Charles began his career in management consulting. As a consultant he worked with clients across a range of industries on issues such as growth strategy and operational improvement. In his most recent role before leaving to lead Nomax, Charles was a manager in at Bain and Company’s San Francisco office.
The Late Charles Voellinger, Sr
Founder
Charles Voellinger, Sr. was a chemist by trade and the founder of Nomax. He started the company in 1982 with his wife and three other partners. Charles had a B.S and M.S in Chemistry from St. Louis University and worked in chemical sales before devoting his attention full-time to Nomax. Through his hard work and dedication, he was able to grow and make Nomax the wonderful company it is today. Charles Voellinger, Sr. passed away in December of 2024.
Pat Voellinger
Co-Founder and CFO
Pat Voellinger holds an MBA from the University of Missouri in St. Louis, a Masters in Mathematics from Northwestern University and a BA in Chemistry from St. Louis University. Before focusing full-time on Nomax, Pat taught accounting for 25 years at St. Louis Community College. At Nomax, Pat is responsible for financial analysis, budgeting and forecasting. Her contributions have been instrumental in Nomax’s growth and success. When she’s not crunching numbers, Pat enjoys playing golf, traveling and spending time with family.
Tom Hemmer
Director of Operations
Tom has 20 years of experience in manufacturing, while spending the last 10 in the medical device space. He holds a bachelor’s degree in Industrial & Engineering Technology from Southeast Missouri State. Tom started his career as a manufacturing engineer at True Manufacturing focusing on process improvement and capital projects. Then getting into medical device, he joined Becton Dickinson in an Operational Excellence role focusing on lean and continuous improvement and eventually transitioned into Operations Management. Before joining Nomax he was a Plant Manager at Bausch and Lomb over their surgical instrument site.
Jeff Matthews
Director of Quality and Regulatory Affairs
Jeff Matthews has twenty-five years of experience at Pharma, In-Vitro Diagnostic, and Medical Device manufacturers where he held positions of increasing responsibility
in Quality & Regulatory. In addition, he has ten years of experience as the site operations leader at a medical device manufacturer. He holds a BS degree in Industrial Technology from Southeast Missouri State University and an MBA from Washington University – St. Louis. Jeff joined Nomax in May 2026.
Cassie Ruppert
Director of Human Resources
Cassie Ruppert has over 15 years of progressive Human Resources experience. She holds a Bachelor’s in Business Administration from University of Missouri – St. Louis and a Master of Arts in Human Resource Management from Webster University. Cassie started her career at Lutheran Senior Services as a HR Assistant and progressed to a HR Manager with increasing responsibilities. In 2013, Cassie joined Stifel Financial as a HR Business Partner where she was responsible for employee relations for the company and eventually transitioned into a HR Project Manager role. Cassie joined Nomax in 2021.