The very nature of our business is personal: from the patients suffering allergies, to the physicians who treat them, to the experts in our labs who develop some of the highest quality allergenic extracts available today. So when we say we continually strive to be your partner in allergy management, we mean it. Our promise is to provide the quality and reliability you’d expect from a company nearing its 100th year in business – while personalizing the service you deserve.

HollisterStier Allergy’s reach spans the entire globe, with services offered from North America to Europe to the South Pacific.


At HollisterStier Allergy, we believe an organization is only as good as its people. We have always sought leaders whose expertise and knowledge will enable us to continue our legacy of revolutionizing the allergenic extract industry. Our management team is the best in the business – and it shows.

Chris Preti

Chris Preti | president
Chris has 25 years of pharmaceutical experience in research and development, marketing, sales and operations. He is committed to building on HollisterStier Allergy’s reputation as a national leader in allergenic extracts and skin test devices, and in helping practitioners meet the challenges they face treating allergy patients. Chris has a Masters of Science in Chemistry from Furman University and a Masters of International Business Studies at Darla Moore School of Business, South Carolina University along with completing Wharton’s School of Business Transformational Leadership for Executives program in Pennsylvania.

Mary Miller

Mary Miller | national sales director
Mary’s strong leadership style was quickly recognized when she joined HollisterStier in 1976, and she was seen as a mentor by many of her colleagues very early in her career. In her role as national sales director, Mary provides guidance and support to HollisterStier’s sales professionals, who view her in-depth knowledge of the allergy field as a great resource.

Derek Constable

Derek Constable, Ph.D. | technical director
Since joining HollisterStier in 1979, Derek has been instrumental in quality initiatives and new product development. He has been actively involved throughout his career in the development of new and improved immunotherapy products as well as diagnostics in both Europe and the United States, and offers an abundance of knowledge and expertise in the immunotherapy field. Derek holds a Bachelor of Science and a Ph.D. in biochemistry from the University of Birmingham, United Kingdom.

Jason Johnson | associate director | commercial operations
Since joining HollisterStier Allergy in 2009, Jason has proven to be a valuable asset to the company in many areas, including production, procurement, operations, and planning. In his current role as the sr. manager of commercial operations he oversees the customer service department and customer support functions. Jason is also responsible for managing product demand forecasting and planning, along with sales analytics. Jason earned his Bachelor of Arts in Organizational Management from Whitworth University.

Jen Beeler

Jennifer Beeler | marketing manager
Jen joined HollisterStier Allergy in 2014 and brought with her a deep background in marketing and communications, predominately in healthcare. She undertook a company rebranding project in 2016, which included the update of product sales materials, and she works continuously to build awareness of our products among healthcare professionals who treat allergy patients. Jen has a Bachelor of Science in public relations & communications from Eastern Washington University and a Master of Business Administration from West Texas A&M University.

Customer Support

We share the same goal: improving the quality of your patients’ lives. So whether you have an order, a question, or a concern, a knowledgeable HollisterStier customer service representative is always ready to provide you with the best in quality service.

Dan Mork

Dan Mork | resident botanist and pollen facility manager
Dan joined HollisterStier in 1977 as a pollen technician, and it was evident even then that he had an aptitude for allergens. His experience in allergy includes mycology, mite production, and extractions, giving Dan extensive knowledge in virtually every facet of the field. He’s a vital part of the HollisterStier Allergy team, serving as a technical advisor and managing both the procurement of pollen raw materials and pollen production. Dan earned a Bachelor of Science with focuses in biology, business administration, and chemistry from Eastern Washington University.

Aimee Corbin

Aimee Erich | customer service supervisor
When Aimee joined the customer service team in 2011, she brought more than 15 years of call center operations experience to the company. She easily manages end to end operations processes to meet customer requirements in a very busy department. Aimee is a Six Sigma Black Belt.

Laura Nunez

Laura Nunez | international customer service
When Laura joined the customer service team in 2011, it was clear that her dedicated service to customers extended beyond the U.S. borders. With her fluent Spanish, Laura was a definite asset to the team, serving the international healthcare community. Her role as our international customer service representative may also find her interacting one-on-one with customers in our exhibit booth at large tradeshows.

Angela Morales

Angela Morales | technical customer service
Angela joined HollisterStier in 2012 as a customer service representative. Her dedication to providing outstanding service to our healthcare professionals led her to advance to the technical customer service role, assisting customers with in-depth product inquires. Angela holds a Bachelor of Science in advertising from the University of Idaho.