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Our Team

Darik Nelson


Darik founded Acumen Technology in 2003, utilizing his comprehensive 35-year background in clean manufacturing technologies and matching equipment to process. At Acumen’s inception, the vision was to create a culture of building long-term relationships by providing exceptional service and process solutions. This philosophy is still and will continue to be the driving force of Acumen. In his free time, Darik enjoys spending time with his family, boating, fishing, grilling, sporting activities, and events.

Krishna Bell

Chief executive officer

After serving 20 years in the Veterinary and Animal Health industries, Krishna joined the Acumen team in 2010. As a biologist, she lends her expertise in environmental monitoring and decontamination effectiveness to the Acumen team. Krishna shares a couple of acres with her husband, their three children, a Great Dane and 18 chickens. She does her best not to bring the Farmer French manicure earned in their large gardens to business meetings.

Jeff Clark

Vice President of Sales | Western Great Lakes

Jeff has a proven track record of strategic planning for Cleanrooms, project execution, USP 797 laboratory design, nanotechnology and containment. He also has accrued significant experience in environmental cleaning, high level disinfection, data center heat management, electrical design, bus systems, sensor and CGMP systems. In what free time he does have, he enjoys competitive sailing, grilling with the family, gardening, and cross-country skiing.

Brent Lloyd

Vice President of Sales | Great Lakes

Brent has been involved in contamination control in one form or another since 1998, with a focus in the healthcare sector.  After obtaining degrees in Biology and Nursing, he has worked in the operating room, sold pharmaceuticals, and worked with air disinfection equipment. He joined the Acumen team in 2015 and continues to utilize his experiences and first-hand knowledge to assist Acumen customers. In his spare time, his wife and three children keep him busy with plenty of activities. They love playing and watching all sports, along with vacations that involve sand and water.

Joe Lyons

Vice President of Sales | Southeast

Joe has many years’ experience working in lab equipment, contamination control and containment industries. His focus has been developing solutions for clean environments with life sciences markets  including pharmaceutical, biotech, medical device and research applications. Joe was with Acumen from 2008 to 2014 and recently re-joined the company in 2018.  Joe and his wife Nancy enjoy traveling and spending time with their children.

Roxanne Schellman

chief operations officer

Roxanne joined the Acumen team in 2013, bringing with her a background in Marketing, Human Resources and Veterinary Medicine. She lives in the country with her husband, four kids, four dogs, cat and an ever-changing number of Angora rabbits. In her spare time she enjoys an eclectic mix of activities including Harley road trips and spinning fiber from her bunnies. She has yet to master crocheting while riding a motorcycle, however.

Eric Weller

Engineering Services Manager

Eric has many years of experience as a service technician. He began his career 20 years ago in aviation and has since branched out to businesses supporting the aviation industry.  His focus has been providing excellent field and telephone technical support to OEMs and end-users. Eric recently joined the Acumen team to supply excellent, local customer service to all of Acumen’s customers. Eric enjoys grilling and gardening. His wife and children love eating the results.

Will Van Wey

Vice President of Sales | Southwest

Will retired from the United States Air Force after 22 years of service. He entered the contamination control industry in 2001 and has since been solving contamination control issues for customers all over the world. Will joined Acumen in 2019 and brought his extensive expertise, knowledge and excitement to the team. He is a devout gearhead, woodworker, photographer, computer geek, and HAM radio operator. Not surprisingly, his wife refers to him as MacGyver…based on his problem-solving ability, we may start calling him that too.

Dave O'donnell


Dave has spent the last 25 years in sales and management positions representing Industrial and Medical products. The last 11 years, Dave's focus has been on Ionization and Contamination Control for the Medical, Electronics, and Semiconductor world. Dave also has an extensive background in pneumatics, automation, and robotics. Dave has a lovely wife and 3 beautiful children, 2 of which are still in Private Colleges. As a result, Dave will be available anytime for professional technical support, from now until the day of his funeral.

Greg Mills

Vice President of Sales | west

With over three decades in high technology clean rooms and high purity processing, Greg Mills holds a MS in Engineering Management from Santa Clara university and an BA in Chemistry from Illinois College. An experienced engineer, marketer and business developer, Greg has a strong background in clean room applications, low and high temperature product environments, contamination control, wet and dry semiconductor processing, as well as metrology techniques and isolation techniques.