In order to fully know and understand who we are as a team, you must first get to know and understand Greg. Greg worked side by side with his wife, Tara, to start and develop Valley Ag Supply into the business it is today. He was a great leader that taught, mentored, and coached his employees, but at the same time gave them great responsibilites to handle and learn things on their own. This great leadership set the foundation of who Valley Ag Supply is as a team that allowed them to carry on the legacy that he started. He was a great husband and father, a well respected person in the community and had a huge passion for agriculture. He will be sorely missed. 
  1. Executive Director
    Greg Pirak
    1970 - 2018
    Co-Founder of Valley Ag Supply Loving Husband Inspiring Father Volunteer Fire Fighter Boy Scout Leader
  1. Executive Director
    Tara Pirak
    Tara is from Akron, IA. In her spare time, she loves to go shopping, paint her nails, go camping and boating on the river, and spending time with her three boys.
  2. Executive Director
    Cathy Nelson
    Accounts Receivable
    Cathy, from Volin, SD, rides horses and spends time with her husband, Jay, and daughters Ava and Rhnissa, when she's not at Valley Ag Supply
  3. Executive Director
    Daryl Nystrup
    Shop Manager
    Daryl, from Volin, SD, enjoys fishing, hunting, and being outdoors.
  4. Executive Director
    Jimmy Sieperda
    Operations Manager
    Jimmy, from Beresford, enjoys spending time with his wife, Jerica, and four children, Anna, Jerit, Sara and Arie. He also likes to work on woodworking projects.
  5. Executive Director
    Laura Nystrup
    Sales Agronomist
    Laura enjoys being outdoors, spending time with her four kids, two grandkids and husband Daryl.
  6. Executive Director
    Alan Moehring
    CCA/Agronomy Manager
    From Blunt, SD, Alan has a Bachelor of Science degree in Agronomy from SDSU. He enjoys playing sports, hunting, spending time with his wife, Bobbie, and being outdoors.
  7. Executive Director
    Tyler Doty
    Precision Ag Technician
    Tyler enjoys hunting, raising his kids (goats), and hanging out with his wife, Katie. You will also see Tyler in a floater during our fertilizer season.
  8. Executive Director
    Cody Olson
    Sales Agronomist
    Cody, Vermillion, SD, joined our crew in December 2017. He's an SDSU graduate in Ag Systems technology. In his spare time, Cody enjoys hunting and four wheeling.
  9. Executive Director
    Alan Richelieu
    From Irene, SD, Alan enjoys spending time with his three girls and his wife, Cassie. He also goes snowmobiling and four wheeling for fun.
  10. Executive Director
    Leah Bunkers
    Sales Agronomist
    Leah, from Granville, IA, joined our team in May 2019 after graduating from SDSU with an agronomy degree. She likes to spend her spare time on the lake, with friends, or helping out at her family’s business.
  11. Executive Director
    Lucas Gustad
    Lucas enjoys spending time on his family farm and being here at Valley Ag Supply!
  12. Executive Director
    Brian Bertrand
    Fertilizer Plant Operator
    If you need some fertilizer blending Brian is your man! You will also see him driving truck from time to time. He enjoys riding his motorcycle when he's not at Valley Ag Supply.
  13. Executive Director
    Leonard Sorensen
    Driver/Plant Operator
    Leonard, from Yankton, SD, enjoys spending time with his wife, Robin, and working on remodel projects around the house.
  14. Executive Director
    Gary Jepsen
    Gary, from Gayville, SD, joined our team in 2019 as an applicator. He and his wife, Shannon, have 4 boys. Gary is also on the Gayville Fire Department, of which he has been the fire chief since 2002.


  1. Executive Director
    Arlo Lykken
    Location Manager/Sales
    Arlo, from Alcester, SD, likes to play music, fish, and spend time with family...and not necessarily in that order.
  2. Executive Director
    Kaci Larson
    Office Manager
    Kaci joined our team in April 2014 with a finance degree from Wayne State College. She enjoys her three boys and spending time with her husband, Jeff.
  3. Executive Director
    Scott Bottorff
    Sales Agronomist
    Scott has been married to his wife, Maureen for 26 years and have two boys, Spencer & Chet. Scott grew up on a farm between Ponca & Newcastle, NE and went to high school in Ponca. In his spare time, he enjoys camping, boating, and fishing. He also enjoys woodworking.
  4. Executive Director
    Terry Kjose
    Terry lives southwest of Alcester. He has one son, Jeremy and two grandchildren. They farm 500 acres and have 10 acres of alfalfa hay. In his spare time Terry enjoys tractor riding, camping, and four wheeling. He has 7 years of experience as a floater operator.
  5. Executive Director
    Nick Sievers
    Nick joined our team in 2018 as an applicator. When he isn't here at Valley Ag Supply, he may be plowing snow for his township or enjoying some barbequing and spending time with his wife, Melissa, and two boys, Owen and Isaac.