Energy Solutions Specialists



Mark Collins

Energy Solutions Specialist

Mark provides energy solutions to clients in the central and east regions of MaxYield's trade area. Full bio coming soon!


CELL: 641-425-5184 | EMAIL:

Adam Gisch

Energy Solutions Specialist

Adam joined the MaxYield team in 2007, utilizing his construction and welding background in a career as a millwright. His career at the cooperative has since included driving tender trucks, unloading grain at MaxYield's West Bend location, managing the service station, and delivering propone before moving into energy sales and solutions.

Teamwork is essential to Adam, who appreciates MaxYield's strong leadership and dependable energy team members. He is passionate about providing solutions all types of energy clients in MaxYield's west area, from those needing bulk oil and fuel to others who are purchasing home heat or do business with one of the cooperative's Cenex convenience stores.

Away from work, Adam enjoys boating and other activities with his family and friends. In the past, he has also assisted with coaching junior high basketball teams in Okoboji and competing in BBQ contests. In the fall and spring, you also might catch him running farm equipment on his family's farm near Algona or his in-law's farm near Buffalo Center.

CELL: 712-270-0010 | EMAIL:

Roger Wagner

Energy Solutions Specialist

Roger provides solutions to clients in MaxYield's central area. Full bio coming soon!


CELL: 712-270-0001 | EMAIL:



Teri Van Meveren

Energy Solutions Coordinator

When you call Energy Central at MaxYield Cooperative, you’re not just talking to someone who sits behind a desk all day. When you connect with Teri, you quickly discover she brings her own brand of energy to the MaxYield Energy Team. She grew up in Hampton, Iowa and her appreciation for agriculture and all things rural took root when she worked for the Cartersville Elevator in Nora Springs. She first joined MaxYield in 2019 as a Client Care Leader at our Everly location before transitioning into her current role as an Energy Solutions Coordinator.

Teri most enjoys providing individualized solutions to MaxYield's diverse array of energy clients. She also appreciates a team atmosphere and the opportunity to grow her skills through the cooperative's Learning and Development initiatives. She is an energy solutions experts and can't wait to serve you!

Making the most of every day is important to Teri, so she cherishes the time she gets to spend with her husband and son. She also enjoys camping, attending auto races and tractor pulls, and anything outdoors.

ENERGY CENTRAL: 515-200-1362 | EMAIL:

Sara Sparks

Client Care Leader/Energy Central Team

Even though Sara has been a member of MaxYield's prestigious All-Star Team, her planned career path was about as far from agriculture as you can get. She attended Rochester Community & Technical College after high school with a plan to someday operate a bridal shop. After graduating in 2004 with her degree in interior design and retail merchandising and working briefly at a Spencer furniture store she pursued a career in agriculture.

She has worked in the grain elevator business since 2009 and has served the Spencer location since 2013. She started in accounting before moving into the grain side of the business, later adding her Energy Central responsibilities. Today, she handles everything from running the scale and cutting grain checks to dispatching fuel orders and tracking inventory. She enjoys the variety of work and finds joy in getting to know clients, especially the Spencer location's coffee crowd.

A self-proclaimed soccer mom, Sara enjoys spending time with her husband Curt and their two daughters, Lillian and Elleanor. She also enjoys cheering on the Iowa Hawkeyes!

ENERGY CENTRAL: 515-200-1362 | EMAIL: