J. Andrew Lange, Inc. is a company built on a reputation for customer service and technical expertise. Technical knowledge of the products represented with design and engineering help means Lange can offer the best combination of products and process to solve water and wastewater challenges.


J. Andrew Lange, Inc, a second-generation family business founded in 1968 is a manufacturers representative for water, wastewater treatment and water storage equipment. Since 1968, J. Andrew Lange has provided customers with reliable products, technical expertise and outstanding customer service. When a water or waste water problem is encountered, contact Lange to provide a solution.
Margery Lange Keskin
Margery Lange KeskinPresident and Owner
Margery Lange Keskin, daughter of J. Andrew Lange is President and owner of J. Andrew Lange, Inc, a second generation family business. Margery holds a Bachelor of Science degree in Medical Technology from Hartwick College, and a Master of Business Administration from Clarkson University.
Michael Mele
Michael MeleVice President
Michael Mele is Vice President of Operations and Regional Sales Manager. In the course of his career, Mike has worked on all facets – sampling, testing, recommendations implementation and operations of treatment programs for both municipal and industrial systems. Mike has been with Lange since 1994 and has over 40 years in the water/wastewater industry.
Julie Barown
Julie BarownRegional Sales Engineer
Julie Barown, P.E. is a Regional Sales Engineer with 20 years of experience in the water and wastewater industry. As a consulting engineer, she designed many new wastewater treatment and collection systems, as well as water and stormwater systems. Julie graduated from the civil engineering department at Rensselaer Polytechnic Institute (RPI) and is a licensed professional engineer in NY State.
Mike Deyulio
Mike Deyulio