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Our Team


Aaran Koller

Owner, President

Aaran has lived in New York most of his life, growing up in Ellicottville where he enjoyed hobbies like mountain biking, trail running, and camping. After high school, Aaran joined the Navy, where he spent 5 years maintaining the F/A-18C Aircraft's engines and fuel systems. He deployed twice and after his service he continued his education by pursuing a Bachelor's degree in Sustainable Energy Management from SUNY ESF and minored in Sustainable Construction. Aaran has continued his career in the solar industry ever since. 

Marlee Koller

Human Resources Coordinator

Marlee Koller is the Human Resources Coordinator with NGS. She manages the onboarding process of new employees as well as providing support and assistance for them throughout their employment with NGS. Prior to her current job, Marlee brings an extensive background from her previous endeavors. These include performing payroll duties at a large hospital; working for the U.S. Department of Defense as a Contract Specialist that trained employees and interfacing with the private companies and the U.S. Navy. Her work experience makes her a valuable resource at our company. In her spare time, she manages to enjoy her “off-time” hanging out or hiking with her husband Aaran, daughter Haisley, and her 3 dogs.

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Cheryl Severance

Accounting Manager

Cheryl joins the Next Generation Solar team with 10 years of financial and administrative experience. Her knowledge and qualifications make her an integral part of our financial department. She enjoys working for and being a part of a company that she believes makes a difference for our future.

Cheryl likes spending time at the beach and loves the outdoors, animals, and most of all her family! 

Emily Messinger

Project Manager & Supervisors Assistant

Emily Messinger joins the team at Next Generation Solar with years of experience in administrative and financial services including Accounts Receivable and Medical Administration. She found a love for community through her work at the YMCA that she carries with her to this day. Her hobbies include spending time at the beach, 4 wheeling and exploring new places. Emily enjoys being outdoors and values time with her friends and family, especially her daughter. She is happy to be part of the NGS team.   


Jenna-Marie LaJoy
Administrative / HR Assistant

Jenna comes to Next Generation with 3 years' experience in marketing and advocating for a better living!  Jenna enjoys spending time with her family, going on adventures, and watching her kids grow into leaders of our future. Jenna is a great asset to our team as she comes with knowledge of site seeing and learning the operations as her husband takes great pride in building them ground up with mechanical leadership.

Mark French

Senior Sales Consultant

Outside of my interest in renewable energy, I like to spend my time with my wife of 20 years and my 3 daughters. We live on a small horse farm which accounts for a lot of quality time together. What I enjoy most, however, is the time I spend coaching and watching my girls play the various sports that they are into, especially basketball. For me, this is a short-lived part of my life and I plan to enjoy it as much as possible.

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Tommy Stubbs

Commercial Project Manager

I love the great outdoors, sports and most of all the future of solar! With 14 years of experience in solar Tommy is a huge asset to our team and helps to train site supervisors and keep everything running smoothly.

Jeff Jankiewicz

Residential Project Manager

"Jeff is a native of Upstate NY and has been involved in the solar industry for over a decade.  He currently resides in Rome, NY and is our Director of Residential Operations. He is dual NABCEP certified as a Solar PV Installation Professional and Solar Technical Sales Professional.  In his free time, he enjoys camping & boating at Raquette Lake, golf in the Summer and snowmobiling in the Winter months."

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