After serving as president of Donco for more than 40 years, Robert is now Chairman of the Board. He is also our most seasoned salesman. He started Donco in 1959 with just one employee. Over the years, the Donco company expanded and includes Ohio Pulp Mills Inc., Ramblin Corp and Poly Recyclers, Inc. In the process of expansion, he built an experienced team of professionals focused on buying and selling secondary materials. This team includes his son, David, who now serves as the president of Donco.

Having the reigns of the company in such capable hands gives him more time to spend with his wife, Linda, their children and many grandchildren.

David Mendelson has been instrumental in expanding Donco’s focus beyond traditional scrap paper by developing markets for a wide variety of secondary raw materials including agricultural byproducts, multi-material laminations, among other twenty-first century waste streams.

David graduated from Vanderbilt University with a Bachelors degree in American History. Like previous generations, he apprenticed early, working during his high school and college years at Ohio Pulp Mills and at Donco’s regional offices around the country. He joined the Donco team full-time in 1989 and assumed his current role as president in 1998. David represents the fourth generation of leadership and lives in Chicago, Illinois with his wife, Blythe and their children.

Donco’s executive vice president services customers through
our Green Bay office, assisting many of the nation’s largest
producers of paper and pulp products. Before joining Donco in
1977, Chuck bought scrap paper, pulp, and chemicals for Fort
Howard Paper Company.

Before that, he earned a Bachelors of Science Degree in
education from the University of Wisconsin in Milwaukee. He
has served on the Board of Directors of both the Institute of
Scrap Recycling Industries (ISRI) and the Paperstock
Industries Chapter of ISRI (PSI). He served ten successful
years as co-chairman of the PSI Standards and Practices
Committee. Chuck and his wife, Linda, reside in Green Bay,
WI.

As Senior Director for Donco, Jeff Sunderman has over 40 years of experience in secondary materials from all types of industries. Jeff serves customers internationally and throughout North America, helping buyers and sellers with his veteran expertise in roll stock, printing grades, packaging and everything in between. He also has deep knowledge of plastics and metals. Jeff joined Donco in 1997 with 17 previous years’ experience as a principal and President of a facility that processed scrap paper, metal and plastic. Jeff is constantly creating new ways to benefit our clients with ingenuity and networking.

Jeff gives back to his community through service as a Town Supervisor and Rotary Club International member. He holds a Bachelor of Science degree in Agricultural Business Economics from Southern Illinois University and lives in SE Wisconsin with his wife, Julie, and
their dogs, cat, horses and goats.

When Bob Harris joined our Chicago operation in 1974 as Vice President of International Sales, he brought to the table years of professional expertise in the carton and container industry. From 1960 to 1971, Bob published Boxboard Containers Magazine, and he served as an international consultant to the packaging industry from 1971 to 1974. In addition, Bob has been involved in the operation of corrugated plants at home and abroad, and he is well versed in board-mill startups and expansions. He and his wife, Brigita, live in Chicago and have 2 grown sons.

Alex joined the Donco team in 2007, bringing with him extensive experience with plastics and textiles. A native of Shanghai, China, Alex graduated from Shanghai University in 1994. His professional experience began with the Mitsubishi Corporation Shanghai, where he became the Chemical department manager, overseeing plastics resin trading and new plant project management. During this time, he also assisted with the export business at his family’s textile plant. Looking to further his opportunities in China and abroad, Alex attended the University of Illinois at Chicago, earning his MBA in 2002. A year later, he started the Starlux Corporation, specializing in sourcing polyester and plastic scraps to other businesses. He now serves the Donco team as their Asia Marketing Specialist.

Greg joined the Donco team in 2012 after 17 years as a commodities and stock trader. He serves customers both domestically and internationally by helping to buy, sell and create markets for a wide variety of secondary raw materials and industrial byproducts. Greg is a graduate of the University of Illinois at Urbana-Champaign with a BA in communications. He and his wife, Alli, and 2 children reside in Northbrook, Illinois.

Matt serves as a Director of Sales and is in charge of the Donco West sales office in Colorado. Matt joined Donco Recycling Solutions in 2009 and brings an energy and enthusiasm to the Donco team. Matt’s broad cross functional experience helps him turn recycling problems into positive economic solutions for our customers. Matt graduated from Michigan State University in 1999 and earned his M.B.A. from the University of Michigan’s Ross School of Business in 2007.

Mike joined the Donco team in January 2011, representing the Southeastern United States. He previously worked for Smurfit Stone Container Corporation, supporting 11 paper mills with their recycling program. As a Donco representative, Mike works with manufacturers, distribution centers, and recycling plants, maximizing revenues by marketing their recyclable materials. Mike holds a BA in Marketing from Georgia State University. Mike and his wife Judy, reside in Atlanta, GA.

Richard Warren joined the Donco team in February of 2014. Although Richard’s educational background is in emergency medicine, he could not turn from the opportunity to become the fourth generation to join the paper and forest products industry. Richard joined Champion International in 1983 as a general laborer, and was promoted to Maintenance Repair and Operations Supply Manager in 1996. In 1999 Champion International was sold to its employees forming Blue Ridge Paper Products. Richard continued with Blue Ridge Paper Products, where he served as Cut-Size Manager and Purchasing Manager. In 2001, Richard moved into the Sales Department, assuming the role of Sales Service Manager. Blue Ridge Paper Products was sold to Evergreen Packaging in 2007. Richard remained with Evergreen Packaging serving as Account Manager in Secondary Fibers for the Bleach Board Division until January of 2014. Richard brings to Donco over 30 years of experience in paper and board manufacturing, sales, and customer service. Richard and his wife, Rhonda, live in Waynesville, North Carolina and have two grown children.

Woody comes to Ramblin Corp with 30 years of research and merchandising experience in the agricultural-products industry. Woody presently markets wide-specification agricultural products, including starches and wood byproducts, into a variety of industrial, agricultural and feed industries. Previously, he worked for The Procter and Gamble Company in Agricultural Chemicals Research and Development and has garnered over 30 years of experience in the grain and feed industries. Woody received a bachelor’s degree in biochemistry at Miami University of Ohio, in 1970. Woody and his wife, Holly, live in Cincinnati, Ohio and have three children and numerous grandchildren.

One of the newest members of the Donco Team, Tim brings 20+
years of knowledge in the seconds and job lob lot field, with
unique experience in the coated, treated, and laminated roll stock
manufacturing sector.  With a never ending passion for creating,
Tim works with clients to stimulate ideas and like all Donco Team
Members, create solutions for unconventional by-products
generated in all areas of manufacturing. In his spare time, Tim
enjoys reading, cooking, and hanging out with his cat Wendall.

Industrial recycling expertise with decades of experience in recovered fiber, packaging, fine paper, bio mass and designing low waste programs for all types of industry that exceed expectations.

Finding highest and best use for recovered materials. Designing and consulting on circular systems for future conservation of resources and smart product design.

Michael Mendelson brings valuable experience to Donco from his time in the logistics industry. His background has equipped him with a deep understanding of supply chain management and operational efficiency, which is essential for streamlining recycling processes. He also developed strong skills in customer relations and negotiation, helping him build lasting partnerships.

Michael graduated from the University of Miami with a Bachelor’s degree in Political Science and a minor in Sustainable Business. Following in the footsteps of previous generations, he gained early experience by working at Donco during his high school and college years. In 2025, he joined the Donco team full-time and is proud to be a part of the fifth generation of his family to work in the recycling industry.

Cathy became a member of the Donco team in 2016, after working 15 years in the technology solutions industry. Since joining Donco, Cathy has helped expand the company’s recycling solutions for a wide variety of plastics. In addition to plastics, she works on initiatives for paper and agricultural by-products. Building strong relationships with clients and creating solutions that are beneficial to all are priorities for her.

Environmental sustainability has always been a guiding principle for Cathy. Industrial recycling provides a way for her to help companies be environmentally sustainable with their by-products in a financially sustainable way and provide quality secondary raw materials to end users. It’s a win, win, win.

Cathy holds a degree in Computer Science, and is a Chicago Conservation Corp (C3) Leader. She and her husband reside in Chicago with their twin daughters.