Meet Your Crystal Creek® Team
Crystal Creek® is a family owned and operated business that has been serving the farming community since 1997. Our team works hard every day to earn the trust of our clients by providing products and services of exceptional performance and value.
Dr. Ryan Leiterman
President and CEO, Director of Technical Services
Dr. Ryan Leiterman is the Director of Technical Services for Crystal Creek®. He joined our team in June of 2012 after leaving a dairy-based veterinary practice in southern Wisconsin. Dr. Leiterman holds degrees in Biosystems, Agricultural Engineering and Veterinary Medicine. Dr. Leiterman is responsible for product formulation and testing, on-farm troubleshooting and calf barn ventilation design.
Dan Leiterman, along with his wife Jan, founded Crystal Creek® in 1997. Dan has been involved in the livestock nutrition and animal health industries since his graduation from the University of Wisconsin-River Falls in 1974. He is responsible for general management and product development.
Jan Leiterman is the co-founder of Crystal Creek®. She joined the Crystal Creek® team full time in May 1999 and is responsible for office administration coordination.
Dr. Nele Leiterman
Dr. Nele Leiterman is a staff veterinarian for Crystal Creek®. She joined our team in April of 2023. Dr. Leiterman grew up in Germany and graduated in 2017 from University Giessen with a degree in Veterinary Medicine. She is responsible for calf barn ventilation design and animal health troubleshooting.
Dr. Darren Zimmerman
Dr. Darren Zimmerman is a veterinarian and livestock nutritionist for Crystal Creek®. He joined our team in June of 2022 after practicing large animal medicine in a mixed animal veterinary clinic in southern Wisconsin. Dr. Zimmerman graduated from the University of Wisconsin-Madison with a degree in Veterinary Medicine in 1999. He has a strong interest in dairy medicine and enjoys working with customers to reach their production and performance goals.
Erik Brettingen is a livestock nutritionist for Crystal Creek®. He joined our team in June of 2015 following graduation from the University of Wisconsin-River Falls with a degree in Animal Science with a meat animal emphasis. Erik grew up on a small family farm in northwestern Wisconsin.
Alex Austin is a livestock nutritionist for Crystal Creek®. She joined our team in July of 2017. Alex graduated from the University of Wisconsin-River Falls with a degree in Agriculture Business with an emphasis in Dairy Science. Alex grew up on a family farm in northwestern Wisconsin.
Cassy is a livestock specialist for Crystal Creek®. She joined our team in September of 2021 after working as a lead calf feeder and caretaker on a dairy farm. Cassy graduated from the University of Eau Claire with a Bachelor of Arts Degree in Journalism.
Mary Christman is part of the Crystal Creek® office administration team. She joined Crystal Creek® in May 2005. She is responsible for customer service, inventory management and organic certification agency interfacing.
Pauline is Crystal Creek’s® representative to the Canadian market where she interfaces with Canadian regulatory agencies on behalf of Crystal Creek®, to facilitate the importation of Crystal Creek® products into Canada.
Rob Tegarden works as the warehouse manager for the shipping and receiving department of Crystal Creek®. He joined our team in September of 2019 and is responsible for inventory management, interfacing with freight companies and supervising pallet orders and small package shipments and receiving.
Warehouse and Maintenance Lead
Eric Hopfensberger works as the warehouse and maintenance lead for the shipping and receiving department of Crystal Creek®. He joined our team in August of 2023 and is responsible for daily maintenance as well as pallet orders and small package shipments and receiving.
Gary Peterson works in the manufacturing department of Crystal Creek®. He joined our team in April 2005 and is responsible for the manufacturing of select Crystal Creek® products.
Angie Holcomb is a graphic designer for Crystal Creek®. She joined our team in February 2011 and is responsible for the design of visual products representing Crystal Creek®.