Doug Punke, CEO

Doug is a 27-year veteran of Cargill. His background includes seven years in Cargill's grain division and nine years with Cargill Corn Milling. Most recently, he was VP of Cargill Energy Risk Management Services, which provides risk management services to a broad base of industrial clients. Doug is a graduate of the University of Illinois.



Steven Dietz, COO

Steve spent five years with ADM and four years as the General Manager of a full-service grain elevator in Illinois. Prior to joining RPMG in 2008, Steve spent four and a half years at Golden Grain Energy, an ethanol plant in Iowa, as their Risk Manager. He brings over 15 years of experience in the grain and ethanol industries and has a solid knowledge of the petroleum, ethanol, co-product, and grain markets. Steve is a graduate of Iowa State University.


Paula Rheault

Paula Rheault, CFO

Paula spent 11 years as CFO and Controller at Minnesota Energy, an ethanol plant and full service grain elevator including agronomy feed and fuel services. She was also an accountant for three years at a hospital in Minnesota and spent two years at a tier two railroad. Paula has been with RPMG since 2007 and brings over 20 years of accounting and management experience that is critical to RPMG's foundation. Paula graduated from Mankato State University with a BA in Accounting and Finance.


Todd Kruggel, Director of Ethanol Marketing

Todd has been with RPMG since its inception in 1996. With a degree in Sales and Marketing, Todd led RPMG's trading as the company grew to over one billion gallons. He brings a tremendous knowledge base of the ethanol industry and has developed invaluable relationships in the petroleum industry.



Darren Knop, Ethanol Marketing Manager (West Coast)

Darren was a Territory Manager at Cargill Salt Division for 14 years. He also spent eight years at Cargill Corn Milling as a National Account Manager. Prior to joining RPMG in 2009, he was the National Marketing Manager for Pacific Ethanol (Kinergy Marketing). Darren brings over 26 years of sales and trading experience and has a core understanding of the ethanol and petroleum industries. He graduated from the University of Iowa with a degree in Political Science and Economics.


Patrick Griffin Boyle, Senior Biofuels Trader

Patrick has been a part of the RPMG team since 2008. Prior to joining RPMG he worked at CHS, Inc as a Commodity Merchandiser on the winter wheat desk. While he currently serves as a Senior Trader for ethanol and biodiesel, since joining RPMG Patrick has taken on the responsibility of developing and growing RPMG's corn oil marketing and biodiesel trading, and has also worked as a Senior DDG merchandiser. Patrick holds a B.S. degree in Economics from Minnesota State University, Mankato and a Master's degree in Management from St. Mary's University in Minneapolis.

Mathias Peterson

Mathias Peterson, Ethanol & Denaturant Trader

Mathias joined RPMG in 2013 where he first started working at the DDGS desk as a merchandiser.  Prior to RPMG he spent several years farming and brings a sound agricultural background and understand of markets to RPMG.  In 2017 he started his current role as an ethanol and denaturant trader.  Mathias holds a B.S. degree in Animals Science and Economics from The Univeristy of Minnesota - Twin Cities.


Matt Niemeyer

Matt Niemeyer, Corn Oil Merchandising Manager

Matt has over 10 years of experience in the animal nutrition industry, starting with Purina Mills in Saint Louis, MO. He moved up to Minnesota with Land O Lakes Purina Feed and then went on to Cargill Animal Nutrition to be a merchant for the Upper Midwest. Prior to RPMG, he was at Cargill as a Regional Sales Manager of Co-Products for the brewing industry in the upper Midwest. Matt is a graduate of Kansas State University.


Natalie Brekken

Natalie Brekken, Corn Oil Merchandising Assistant

Natalie joined the RPMG team in 2012 after spending the previous 5 years with Cargill in various business units including Industrial Oils and Lubricants, Horizon Milling, and the Brewers Residual Solutions Team. Prior to Cargill she was with Restaurant Technologies Inc. Natalie currently serves as a merchandising assistant for our corn oil team. Natalie is a graduate of St. Mary's University in Minneapolis with a degree in Marketing.


Jim Montbriand, DDGS Marketing Manager

For 14 years, Jim was a Senior Merchandiser of Distillers Grains at Commodity Specialists Co./CHS. He has been with RPMG since 2008 and has been a critical part of the development and growth of the Co-Products division. Jim has a great knowledge base of the distillers and grain markets and has spent the past 16 years developing solid customer relationships in the industry. Jim is a graduate of St. Cloud State University.


Trevor Kallop

Trevor Kallop, DDGS Marketing Manager

Trevor joined the RPMG team after spending the past 5 years with Cargill merchandising non-grain feed ingredients. More specifically, Trevor worked as a DDGS export manager and spent the last four years merchandising DDGS as a marketer for Cargill. Previous to his work at Cargill Trevor spent 4 years working in Boston for a publishing company as a print buyer. Trevor graduated from the University of Albany in New York.


Phil Phillips

Phil Phillips, Technical Director

Phil has over 20 years of experience in the brewing industry, encompassing 5 different breweries from small craft breweries, up to multi-million beer barrel breweries in various production positions including Master Brewer and Plant Manager. Prior to RPMG, he spent nine years with Cargill Malt in roles including North American Technical Services Manager, leveraging his diverse brewing experience to provide customer solutions; and R&D operations in Cargill Malt's pilot malting and brewing facility. Prior to brewing, Phil served in the U.S. Navy, Nuclear Power Program.


Jessica Wiechman

Jessica Hoffmann, Regulatory & Compliance Manager

Jessica has been with RPMG since 2007, starting out in the ethanol billing department and through the years transitioning to her current post as Regulatory and Compliance Manager. Her main focus at RPMG is to provide a strong understanding and effective implementation of state, federal and international compliance programs, such as the federal Renewable Fuels Standard (RFS2) and the California Low Carbon Fuel Standard (LCFS). Jessica is a graduate of Ridgewater College, Hutchinson and Minnesota State University, Mankato.


Scott Kuehn

Scott Kuehn, Systems & Data Manager

Scott has been affiliated with RPMG since its inception in 1996. He provided IT related services and support on an as needed basis until 2006 when he became a full time employee. Prior to joining RPMG, he was a Software Engineer at Unisys Corporation in the Twin Cities for 19 years. Scott is a graduate of Minnesota State University – Mankato with a degree in Computer Science and Mathematics.


Kristin Oftos

Kristin Oftos, Controller

Kristin has been a member of the RPMG team since 2009 and is responsible for managing the day to day operations of the RPMG Accounting team. She most recently worked as an accountant for G & K Services and was Operations Manager for a law firm in the Minneapolis/St Paul Area. Kristin is a graduate of Concordia University - St. Paul and completed her Master's Degree in Organizational Leadership from St. Catherine University in May 2013.