Better Solutions for Water & Wastewater Since 1973

Celebrating over 45 years of providing consistent, value-based, and high-quality solutions, Koester represents industry leading manufacturers of water and wastewater treatment and pumping equipment. Koester specializes in applications, design, operations, parts, maintenance, sales, technical support and service.

Offering Comprehensive Solutions
• Expert engineering staff
• Integrated industry involvement
• In-house customer care
• Knowledgeable sales force
• Support before, during and after the sale
• Fast response by field service technicians
• Factory certified technicians

Our Founder - Donald J. Koester

Koester Associates was founded in 1973 by Don Koester. His commitment to truth and loyalty, as well as his technical competence and keen eye for details, is and has always been the foundation of Koester Associates. His guiding principles then remain ours today. Koester Associates is: Caring. Knowledgeable. Loyal.

Our Valuable Team Members

Mark Koester
President & CEO

Mark Koester has been active in the water and wastewater industry in Upstate New York for over 30 years. Mark has a degree in Sanitary Engineering and retains leadership positions in the New York Water Environment Association (NYWEA) and New York Rural Water Association (NYRWA). He remains active in the American Water Works Association and local Water Works affiliates.

Peter J. Radosta, P.E., BCEE
Senior Vice President

Pete Radosta is a graduate of Clarkson University and has a Masters degree from Syracuse University. He is a licensed Professional Engineer in New York State and is a Board Certified Environmental Engineer with the American Academy of Environmental Engineers. Pete holds leadership positions with the NY Section AWWA and NYWEA.

Gregg Palmer
Chief Operating Officer/Sales Engineer

Gregg has been leading strategic sales and business development efforts in the chemical industry for over 15 years. He delivers a broad perspective of the field due to his experience in both the manufacturing, as well as the distribution, of products that support the water/wastewater industry.

Gregg began his career with Poly Processing Company and, as National Sales Manager, he developed a successful sales and marketing strategy that led the company to become an industry leader in chemical storage tanks.

Since joining Koester as COO in 2014, Gregg has capitalized on his strategic experience to add to the breadth of Koester’s ability to offer clients comprehensive solutions to their community’s water and wastewater goals.

Gregg is a board member of the Central Chapter of NYWEA.

Jacob Scherer, P.E., 
Senior Vice President of Downstate Operations

Jacob has 25 years of experience in the water and wastewater industry with increasing levels of responsibilities from engineering, sales and ownership management.  Jacob earned his bachelor’s degree in Civil Engineering from Rochester Institute of Technology in 1988 and holds a master’s degree in Business Administration from St. John Fisher College.

He has been newly appointed as Senior Vice President of Downstate Operations and will be working out of the Kinnelon, New Jersey office.  He is a licensed P.E. in both New York and Pennsylvania.

Michael Ademovic
Vice President of Sales – Western New York

Michael Ademovic joined the water and wastewater industry in 2013, when he joined his family’s business Burgh Schoenenberger Associates. Mike has been working with industry professionals on a variety of instrumentation, control, and pumping system and process projects. Mike’s attention to detail and experience on equipment offers end-users, contractors, and engineers’ confidence in providing effective solutions. Mike is heavily involved with Western NY and Genesee Valley water works affiliates.

Upstate Sales Team
Email Sales

Bill Driscoll
Sales Consultant

Bill Rourke
Sales Consultant

John O’Connell
Aftermarket Specialist

John Whitney
Technical Sales Consultant

Downstate Sales Team
Email Sales

Rich Canton
Sales Engineer

Syd Harris
Sales Engineer

Inside Sales and Technical Support

Kyle Buckles
Bidding Coordinator

Rick Buckles
Technical Resource Engineer

Kate Hurrle
Senior Project Manager

Cindy Brown
Project Manager

John Revette
Inside Sales Engineer

Parts and Service
Email Parts
Email Service

Eric Koester
Service & Retrofit Manager

Rob Samuels
Operations – Project Manager

Robin VanSlyke
Parts Coordinator

Liz Markle
Project Coordinator

Heidi DuSell
Service Coordinator

John McGowan
Technical Systems Engineer

Chris Frechette
Field Service Technician

Bob Gillette
Field Service Technician

Brian Link
Service Specialist

Jason Miller
Field Service Technician

Bryan Osborne
Field Service Technician

Chris Siddall
Field Service Technician

John B. West
Field Service Technician

Phil Opera
Field Service Technician

Jeff Woodworth
Warehouse Associate

Daniel Jean
Service Supervisor


Michele Ficarra

Pamela Leary

Mary Lou Pace
Consultant – Finance Manager

Maria Murdie
Finance Manager

Noelle Markle
Executive Administrative Assistant & Office Manager

Sheena Williams
Assistant Finance Manager

Erika Sumner
Administrative Assistant