Cemen Tech’s Support Team is comprised of some of the most knowledgeable men in the volumetric mixing industry. Our team has over 100 years’ experience between them. In addition to having an experienced team, Cemen Tech and their worldwide network of Authorized Dealers have the largest parts inventory in the industry. If you have a problem with your mixer, our helpful, knowledgeable staff is available to get your mixer back up and running as quickly as possible.


Drew Bryant

Technical Service Manager

Drew came to Cemen Tech in March of 2018 with parts experience and a mechanical background from growing up on a ranch and working for multiple Co-ops. He has a Business degree from Northeast Community College in Norfolk, Nebraska. His mechanical experience with trucks and machinery play a role in him diagnosing service problems and ordering parts for customers. When not at work, Drew likes to coach middle school football for a local school, watch college football and do carpentry projects.

Jim Bishop

Field Service Specialist

Jim started at Cemen Tech in 2012 with a service and manufacturing background and has an Associate Arts degree from Des Moines Area Community College. His on going training and experience in the service and repair of volumetric mixers has helped Jim become an excellent resource for our customers. When Jim is not working he enjoys working on his hobby farm.

John Stiles

Customer Service Manager

John joined Cemen Tech in 2021 with a customer service and manufacturing background. He worked for an aerospace company in Des Moines for 5 years as a lead machinist and tech after being in management for a local restaurant in western Iowa for years prior. His experience in lean manufacturing and customer care allows him to diagnose issues and find solutions while providing grade A customer service. Outside of work, John enjoys spending time with his fiancé and son while being an avid sports fanatic.

Tyler Iversen

Field Service Specialist

Tyler joined Cemen Tech in the fall of 2016 as a member of the Customer Support team. Married 35 years, Tyler grew up on a ranch in the mountains of Colorado and moved back to Iowa to work with his father turning a family farm into a housing development near Des Moines. He enjoys traveling to customer sites doing start ups and education about volumetric mixers.

Piarra Hopkins

Customer Service Coordinator

Piarra joined Cemen Tech in 2023 with a customer service background. Piarra was born in the UK, lived in Spain and moved to Iowa in 2010. She has worked in customer service for over 7 years. She enjoys assisting customers by phone and email. Outside of work, Piarra enjoys spending time with her daughter, working on cars and traveling.

Aaron Christensen

Technical Support Engineer

Aaron has 20+ years of customer service/technical support in the telephone, precision-ag, and software industry. He has spent 7 years in the military in artillery in the roles of truck driver, RTO (radio telephone operator) and assistant gunner on the howitzer. He is married to one of his best friends (Valerie) and they enjoy camping, cooking, biking, fishing, hunting, and hanging out with their 2 dogs together, oh – and watching Wheel of Fortune.

TJ George

Truck Management Specialist

TJ joined Cemen Tech in September 2018 as the Truck Management Specialist. After high school studied at Des Moines Area Community College and then spent 8 years working in the semi-truck industry. His knowledge of trucks has helped streamline our mounting processes and allowed us to enter into previously untapped markets. Outside of work TJ enjoys, cooking, time with family and anything with an engine.

Ryan Clark

Service Area Manager

Ryan joined Cemen Tech in August 2020 as a Regional Dealer Support Manager. He brings more than 20 years of experience from previous roles throughout the volumetric mixer industry. These roles ranged from operator to general manager, working with contractors and Departments of Transportation alike. Originally from California, he now resides in Middle Tennessee, where he enjoys spending time with his wife, Corie, and their three children, Parker, Morgan, and Brody.

Randall Robertson

Regional Technical Support Manager, Midwest Territory

Randall is originally from Houston, Texas. He started his journey at Cemen Tech on March 15, 2021 as an assembly technician with a strong mechanical, diagnostic, and customer service background. Outside of work he enjoys spending time with his family, watching baseball, fishing, and working on cars. He is excited to continue growing in his role here at Cemen Tech.

Jordan Leach

Regional Technical Support Manager, Midwest Territory

Jordan Leach joined Cemen Tech in June 2021. Before, he spent nine years as a diesel mechanic and recruiter with the United States Army. Along with attaining the rank of Staff Sergeant, he has experience troubleshooting, servicing, and ordering parts for equipment. Outside of work, Jordan enjoys watching football, hunting, fishing, and spending time with family.

Jermyn Bryant

Regional Technical Support Manager, South Territory

Jermyn joined Cemen Tech in June 2022. Previously, he had spent seven years as a reconnaissance infantryman, and recruiter with the United States Army. Outside of work, Jermyn enjoys spending time with his wife and children, watching football, lifting weights, hunting and fishing.

Nelson Gould

Regional Technical Support Manager, Northeast Territory

Nelson came to Cemen Tech in 2020 with a technical support and repair background. He has a degree from Ohio technical college as a master technician. Nelson has 35 years experience in the field ranging from hydraulics to electrical which allows him to better understand and assist our customers with their volumetric mixers. Outside of work he enjoys cooking watching sports and rebuilding older vehicles.

Phil Edwards

Regional Technical Support Manager, Southeast Territory

Phil started at Cemen Tech in 2018. Previously, he served in the Army for 28 years. Outside of work, Phil is a master technician for Harley Davidson and likes to work on Harleys at home in his spare time. He also enjoys hiking the mountains in Georgia.

Tyler Stoll

Regional Technical Support Manager, West Territory