Leadership

Leadership

ONCE TEAM

The ONCE staff is comprised of multi-disciplined experts including inventors, product and application engineers, marketing and creative professionals, sales consultants, business managers, and customer service representatives.

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Zdenko Grajcar
Founder & CEO

Zdenko Grajcar is an innovative thinker, inventor and businessman in the lighting world who has brought his passion to Agricultural lighting—specifically for improving productivity of plants and animals using light.  He holds a Masters Degree in Physics from Comenius University in Bratislava and attributes his vast knowledge base to “Google University”.   Zdenko was formerly the Founder & CEO of Lumificient Technologies, a Minnesota company bought by Nexxus Lighting.

Zdenko has forged solid relationships with vendors, customers, and business leaders throughout the globe in order to further agricultural lighting.  Zdenko is a “lighting samurai”, as he was labeled by a Chinese sage, and is singularly focused on bringing the science of light to the world of agriculture.

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Zdenko Grajcar
Founder & CEO
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Pete Hentges
Controller

Pete Hentges graduated from the University of St. Thomas in St. Paul, MN, earning Bachelor of Arts degree in Accounting.  He has over 20 years of financial management experience in the construction, printing, media and lighting industries.  Before joining Once Innovations, Pete was the Chief Financial Officer for Duplication Factory LLC in Chaska, MN.

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Pete Hentges
Controller
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Josef Hoffmann
General Counsel

Josef Hoffmann graduated from Bradley University with a degree in Engineering Physics and earned a Juris Doctor with Honors from Drake Law School.

Josef is a patent attorney with the United States Patent and Trademark Office.  Before joining ONCE, Josef was a partner at The Zarley Law Firm in Iowa.

He is a former Officer of the Iowa Intellectual Property Association and keeps watch over the ever-growing ONCE patent portfolio.

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Josef Hoffmann
General Counsel
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Ashlee Glastetter
Assistant General Counsel

Ashlee Glastetter graduated from the University of Missouri with Honors, earning a Bachelor of Arts in English and a Bachelor of Journalism.  Ashlee earned a Juris Doctor with Honors from the University of Minnesota Law School.  Ashlee works with Joe to keep watch over the ever-growing ONCE Innovations.  

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Ashlee Glastetter
Assistant General Counsel
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David Natarelli
Senior Engineer and R&D Team Lead

David has over 10 years of experience in the lighting industry; leading various teams with extensive offshore manufacturing in the Asian marketplace. He is both a designer and manufacturer and has developed products lines for fluorescent and LED product groups. 

David received a Bachelor of Science degree in Electrical Engineering from the Rochester Institute of Technology in New York.

Natarelli is primarily responsible for finding business through new markets.

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David Natarelli
Senior Engineer and R&D Team Lead
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Aaron Stephan
Research Scientist

Aaron holds a Bachelor of Science degree from the University of Wisconsin Milwaukee and a Ph.D. in Biology from Johns Hopkins University.  Prior to joining the ONCE team, he worked as a postdoctoral fellow at the University of California San Diego. Drawing on 15 years of research experience in Microbiology, Neuroscience, and Plant Science, Aaron leads genetic research at ONCE in order to develop new and improved technologies that integrate light's influence on physiology and development within crops and livestock. 

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Aaron Stephan
Research Scientist
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Tatijana Fisher
Animal Research Scientist

Tatijana leads research at ONCE in discovering how light influences the performance and welfare of animals. She received her PhD in Animal Science from the University of Kentucky where her work centered on determining the nutritional and management needs of heritage breed chickens compared to commercial broilers and layers. In addition to her extensive research background, Tatijana brings hands on experience of working with livestock to her role.

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Tatijana Fisher
Animal Research Scientist
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Ron Demshar
Director of Agricultural Sales for Layers

Ron Demshar received his Bachelor of Arts degree in Business Finance from the University of Wisconsin Eau Claire.  Ron is a seasoned sales representative with an extensive background in electronics and electrical products.

Before leading the Agricultural Sales efforts at ONCE, Ron was President of RD-Repping, Inc. for a decade.  Ron is also the focal point for ONCE customers focused on egg production. 

Contact Ron: rdemshar@onceinnovations.com or 763.607.8780.

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Ron Demshar
Director of Agricultural Sales for Layers
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Lindsay Harr
Inside Sales Specialist - Layer

Lindsay brings great experience in Agriculture and Sales to our ONCE team.

Contact Lindsay: lharr@onceinnovations.com or 763.381.5621.

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Lindsay Harr
Inside Sales Specialist - Layer
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Brian Babb
Photobiology Swine Sales

Brian Babb is a lighting veteran.  He worked at Lumificient Technologies, Nexxus Lighting, and started his own LED lighting start-up prior to joining ONCE.

He leads new business development efforts and heads our Swine Segment.

Contact Brian - bbabb@onceinnovations.com or 763.843.0500.

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Brian Babb
Photobiology Swine Sales
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Mike Roth
Regional Swine Sales

Mike Roth is our Regional Sales Manager for Iowa and Missouri in the swine market.  He comes to Once Innovations with several years experience in the lighting business. Please give Mike a call for all your swine lighting needs!

Contact Mike - mroth@onceinnovations.com or 319.461.1177.

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Mike Roth
Regional Swine Sales
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David Granger
Broiler Segment Manager

David Granger has 23 years experience in the poultry industry. David is a former broiler manager, broiler tech, pullet tech and breeder tech. He understands the lighting demands of the poultry industry and what type of LED lighting will make you a successful producer.

Contact David - dgranger@onceinnovations.com or 336.927.3061.

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David Granger
Broiler Segment Manager
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Bennie Hutchins
Regional Sales for Broilers

Bennie brings great sales experience in the Broilers Market.

Email Bennie at: bhutchins@onceinnovations.com or 763.381.5621.

 

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Bennie Hutchins
Regional Sales for Broilers
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Brianne Madison
Customer Service Mgr / Inside Sales Rep - Broilers

Brianne brings over 15 years of experience in Customer Service, Senior Administration, and Support Management to her role at ONCE. As a Customer Service/ Inside Sales Rep, she provides specialized support for the broiler segment. 
 
Contact Brianne - bmadison@onceinnovations.com or 763-381-5621.
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Brianne Madison
Customer Service Mgr / Inside Sales Rep - Broilers
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Tanya Streifel
Marketing Manager

Tanya has over 5 years of professional marketing experience in a variety of roles and industries. She received her Bachelor of Science degree in Marketing from the University of Wisconsin- River Falls and an M.B.A. from Hamline University. 

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Tanya Streifel
Marketing Manager