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Meet The Team

Robert Tierney

Chief Executive Officer

From running startups in college, where he received his BS in accounting, to having a career as a financial auditor and now CEO of Animal Care Systems, Robert has always had a passion for bringing people and organizations together and is a devotee of the EOS System. Robert is a father of 3 and a black belt in Brazilian Jiu-Jitsu. He is an avid foodie and coffee enthusiast. He likes to spend his free time in the mountains with his family and English Cream Retriever hiking, mountain biking, fishing, and reading.

Accounting Team

Tim Hochstetler


With over 13 years of accounting experience, both in the public accounting and private sectors, Tim not only keeps a savvy eye on all our financial functions; he also provides us with essential strategic analyses. He is a trouble-shooter at heart and is passionate about identifying issues and focusing on solutions. An avid outdoorsman and ardent family man, he enjoys every occasion to get his young family outdoors and active.

Mike Dulberg

Fractional CFO

Mike brings with him nearly 35 years of finance and accounting experience in both public and private companies across multiple industries. He’s a numbers guy and brings a few gray hairs to the team. Mike looks at the big picture and focuses on both long-term planning and higher-level corporate issues. A quote from Mike heard around the office recently was “I love what I do and will keep doing it as long as I can.” One thing Mike likes more than finance and accounting is skiing. If you can’t find Mike during ski season, search the mountains.

Brittany McKinney

Processing & AR Specialist

Brittany has been with Animal Care Systems since 2015. She started out as a member of the production team and has since been promoted to her current position on the office team.  Brittany has an affinity for office software programs, and when we don’t know how to enter something, or delete something, invariably, she is the one that can show us how. She loves interacting with the customers and sales representatives. Her goal within the company is to help it succeed by finding new ways to make things more efficient. When she is not busy at work, she has her hands busy at home with a toddler son, husband, and dog that she loves dearly.

Jennifer Tinaglia

Staff Accountant

Jen loves math and has been known to take computer programming and advanced math classes at night, for fun! Highly efficient and always smiling, Jen loves the challenge of working with numbers and making sure everything balances. She has been at ACS for more than eight years, and with her husband for more than 35 — quite a milestone! Jen, a Colorado native, has four grown sons, one granddaughter, two dogs, and a cat.

Andrea Cervantes

Accounts Receivable Associate

Andrea has been with Animal Care Systems for almost seven years. Andrea started on the production team, is a self-starter, and always notices when something needs doing and to quickly pitch in. A very successful member of the production team, she showed an aptitude for office work and has now transition to the office team. Andrea is also a mom of 3 boys. She loves going to Mexico to see her family on Christmas and tries to go down there as much as she can. Andrea enjoys the little things in life such as spending time with friends and family, going out for a walk, or simply sitting at the porch to enjoy a nice cold beer and look at her kids play. She has incredible team spirit and is one of ACS’s biggest cheerleaders.

Sales Team

John Park

Director of Sales

John’s career in laboratory animal sciences began as a voluntary caretaker at Texas A&M University in 1992. He advanced to manager of its Comparative Medicine Program while obtaining his LATG in 2000. An award-winning lab manager, John is passionate about the lab animal community, and his 12 years with Animal Care Systems has provided him an excellent opportunity to serve the industry by providing excellent products, installation, and services. John lives north of Houston, is a fanatic of authentic barbecued meats, and spends as much time with his family as he can.

Teresa McKernan

Manager of Business Development, Canada

After spending 28 years working in the laboratory animal field, Teresa is well-suited to help her clients connect the dots as to which solution will best fit their current and strategic requirements. She has managed facilities, renovations, new builds, and used and purchased a wide range of equipment for many different applications. Teresa is a Vet Tech with a business degree in Veterinary Services Management. She is also a Registered Master Laboratory Animal Technician, and a past president of the Canadian Association for Laboratory Animal Science (CALAS ACSAL). Teresa’s favourite hobby is reading, reading, reading, with a little bit of hiking/biking/kayaking thrown in for good measure.

Mohammed Halal

Director Business Development, India Subcontinent and Middle East

With a M.Sc in Biochemistry and over 25 years of practical experience with Laboratory animal house management, GLP Quality Assurance Units (QAU), Preclinical Toxicology, GLP CROs, and Indian IACUC equivalents, Halal came highly recommended to the ACS team. Halal has an incredible amount of energy and is famously courteous to all his colleagues. When he isn’t working, he is out in the garden, or watching cricket matches and the news.

Kim Powers

Office Sales Associate

Kim has been working in the animal care industry for the past 13 years. She earned a Bachelor of Science degree in Business from John Brown University. She enjoys assisting the sales team to provide outstanding customer satisfaction. She appreciates the importance of providing exceptional service to the team, along with reminding them to have a few laughs every now and then.

Stephanie Tierney

Office Sales Associate

Stephanie is a Social Anthropology PhD student at the University of Edinburgh (with a master’s in Museum Studies from the University of Glasgow). Her previous work experience includes operations management, development, and communications in the non-profit sector, higher education, and the lab animal sciences field. Stephanie has a fondness for data and a questionable affinity for spreadsheets.

Keshia Duncan

Office Sales Associate

Keshia holds a bachelor’s and master’s degree in economics and has expertise in data and analytics. She also is a yoga instructor and a concert pianist. Her favorite piece to play is Rachmaninoff Prelude Op. 3 No. 2 in C# minor. “Playing the piano always makes me feel amazing and free, and it makes people happy to hear it!”

Marketing Team

Teresa McKernan

Director Of Marketing

After spending 28 years working in the laboratory animal field, Teresa is well-suited to help her clients connect the dots as to which solution will best fit their current and strategic requirements. She has managed facilities, renovations, new builds, and used and purchased a wide range of equipment for many different applications. Teresa is a Vet Tech with a business degree in Veterinary Services Management. She is also a Registered Master Laboratory Animal Technician, and a past president of the Canadian Association for Laboratory Animal Science (CALAS ACSAL). Teresa’s favourite hobby is reading, reading, reading, with a little bit of hiking/biking/kayaking thrown in for good measure.

Austin Corell

Marketing Associate

Austin brought his editorial experience from the publishing industry when he joined Animal Care Systems in 2016. His already-large appreciation for the importance of the research industry peaked during the COVID-19 era. A native of Colorado, his pastimes include learning about music, language, film, and nuclear energy. His favorite author is Charles Dickens.

Engineering Team

Dirk Spearing

Director of Technology and Engineering Integration

Dirk spent decades honing his expertise as an IT consultant before he joined Animal Care Systems in 2018. He’s an outdoorsman who enjoys spending time on his farm, tending his gardens and improving his horticultural knowledge. He also likes rafting, especially within the Grand Canyon, and he’s an avid follower of Formula 1 motorsport.

Andrew Poulter

Director of Research and Development

An accomplished system engineer specializing in electro-mechanical solutions with progressive experience in Mechatronics research and design, Andrew is ensuring animal welfare is integrated with engineering innovation as his top priority. He has over 25 years’ experience developing robots and robotic tools to keep Law Enforcement and our Military out of harm’s way. Andrew is now applying this robotics knowledge towards researcher and animal welfare, developing breakthrough technology to help medical exploration.

Dr. Beverly Chua

Project Coordinator/Staff Veterinarian

Dr. Bev Chua, our Staff Veterinarian & Engineering Project Coordinator focused on clinical and research work prior to starting with ACS in 2013. She liaises with the engineering team, merging her animal perspective with their innovative ideas. Outside of work, she works part-time at a local shelter, fosters animals and hikes in the great outdoors.

David R. Heldt

Manager of Design for Manufacturing and Continuous Improvement

Born and raised on a farm in Michigan, Dave moved to California after high school graduation.

“Celebrating 39 years with my wonderful wife. Candee and I have now been living in Colorado for 30 years. I have always loved building and designing. The challenge of design that is so exciting, anyone can buy a plan and build what someone else has designed. But taking that design and looking at it with an open perspective will allow you to make a new intent with an old design. My love for my wife and design will be with me always.”

Eric Corell

Product Engineer

A native of Colorado, Eric has a degree in chemistry, but his hunger for knowledge didn’t stop with a diploma. The polymath is curious to understand and is always eager to continue learning — especially about engineering and science. He likes studying and refining process as it relates to everything from design and prototyping to mountain biking and beer brewing.

Operations Team

Valerie McKenney

Operations Manager

Valerie has education and experience across many disciplines within operations. During her free time, she is drawn to nature, almost literally, because her rural property has bears, mountain lions, and other curious animals. She enjoys hiking, which allows her to immerse herself in the wilderness and appreciate its complexity more fully. She and her family also have two giant domestic cats — dubbed Ink and Stink.

Jessica Hankins

Inventory and Purchasing Manager

Jessica is a Colorado native who has worked in supply chain for 10 years in various industries, from supplements to skin care to food. Animal Care Systems is her favorite role because the research and animal welfare aspects of the company make her feel a strong sense of purpose. Jessica’s favorite thing about supply chain management is that there’s always a new challenge; every day is different. Jessica enjoys going to comedy shows, concerts, and sporting events but her favorite thing is relaxing with her husband and 2-year-old boxer mix, Breezy.

Chris McKinney

Field Service/Maintenance Technician

With a background in commercial transportation, Chris is good with his hands nearly by default and has a keen eye for detail. His immense dexterity and overall acumen are invaluable assets in the field — and in his free time. He’s a hobbyist at heart: He builds and machines his own ballistics equipment, and he and his wife like to work on complex home improvements to make sure that even the final stroke of paint matches their vision.

Miguel Rivera

Shipping and Receiving/Production Team

Miguel has always done his best to help people and he appreciates his role at Animal Care Systems since it gives him that opportunity. He enjoys being able to ship items across the world to help biomedical research since that means helping people in need. Miguel enjoys learning on the job and while here has expanded his experience with building, shipping internationally, and communicating with customers.

Jesse Seigel

Production Lead

With experience successfully managing his own companies, Jesse holds a broad set of skills. He has an affinity for motorsport and always tries to stay busy when away from work: camping, traveling, extreme offroading, having a blast with his family — if he can think of it, there’s a high likelihood he’ll plan to do it soon!


Production Team

Rafael likes to work with his hands, especially fixing things, whether at home or resolving an issue in a production process. He is enthusiastic about building Animal Care Systems equipment properly so that the final product is perfect. In his time away from the office, he likes to be with his grandchildren and tend to his garden.

Cau Nguyen

Production Team

You will often find Cau absorbed in building Animal Care Systems racks – his studious, meticulous nature lends itself well to the detail-oriented focus needed for this key function. In his free time, Cau enjoys a little bit of everything: running, reading, hiking, watching movies, and nurturing his house plants.

Teresa Cortez

Production Team

Teresa has been with the company for 11 years. One of her favorite things about her role with the company is none of the tasks are repetitive, so most days feel like new experiences. Teresa likes to learn new things and loves getting along with her fellow team members. During her free time, she likes exercising, but especially engaging with others in Zumba dancing courses.

Yuliana Flores

Production Team

As part of our production team, Yuliana is admired for her work on building our products and her intense curiosity when it comes to learning opportunities; however one of her biggest contributions to the team is to help feed the nice friendly vibe we have going at Animal Care Systems: she is a real people person, and loves to make people laugh.

Margarita Flores

Production Team

A person that has been noted as very organized, with excellent time management, Margarita is celebrating twenty-three years with our company. Margarita is a confident guide and advisor to the trainees, as well as to people that have been here for longer, since she has seen and done it all. She enjoys her work since it is constantly changing and never gets stale. Margarita’s favorite hobby is staying close to her family and spending time with them.

Maria Rosales

Production Team

One of the most experienced members of our team, Maria has been with us for 28 years. Maria is fastidious when it comes to making sure that everything is perfect before it goes into our shipping boxes, and she has a fascination and love for all things soldering. Due to her thorough understanding of our systems, she often becomes a mentor to the newer people, and we are constantly extracting information from her brain bank. When not at work, she lavishes attention on her house, garden and grandchildren.

Enriqueta Morales

Production Team

When Enriqueta came on board in 2010, she brought with her an incredible attention to detail that complemented her straightforward professionalism. She is easygoing and appreciates that her important work and processes are plain because one of her favorite tasks is verifying product and process quality and basking in the enjoyment when she finds all the processes are done correctly. In her free time, she spends as much time as she can with her family.