David Lintz, Ethan Lang and Maija Seppanen join McMahon

Combined they bring a total of 50 years of architecture and engineering experience to the company

Published Wednesday, March 30, 2022


McMahon, a full-service, professional engineering and architectural firm, has hired David Lintz as a senior architect as well as Ethan Lang and Maija Seppanen as water and wastewater engineers.

Lintz brings 35 years of architectural experience to McMahon, including running his own business for more than a decade and working as a building plan reviewer and inspector for the State of Wisconsin. Lintz graduated from the Milwaukee School of Engineering with a bachelor’s degree in architectural engineering.

Lang graduated from Michigan Technological University with a bachelor’s degree in environmental engineering. Lang is beginning his working career with this water and wastewater engineering position. Prior to working at McMahon, Lang interned in the consulting and industrial fields, primarily focusing on storm and groundwater sampling, mapping and compliance.


Seppanen also graduated from Michigan Technological University with a bachelor’s degree in environmental engineering. She has a master’s degree in environmental engineering from University of Iowa. Seppanen comes to McMahon with more than 17 years of experience working on municipal wastewater and drinking water projects in Wisconsin, soil and groundwater remediation projects across the U.S., and large dairy facility projects in Wisconsin and Michigan.


“I am grateful to have the opportunity to continue to work on projects that provide clean water or soil on properties that can be redeveloped to enhance communities,” explained Seppanen. “I am looking forward to being a part of the McMahon team and assisting with the many community and municipal projects that McMahon is a part of.”


To learn more about McMahon’s projects and open positions, visit mcmgrp.com.


Headshots Included.

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David Lintz, senior architect for McMahon


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Ethan Lang, water and wastewater engineer for McMahon


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Maija Seppanen, water and wastewater engineer for McMahon




McMahon has provided professional engineering and architectural services to our valued customers for more than a century. Our team of over 150 professionals serves our clients from our corporate headquarters in Neenah, Wisconsin along with our Illinois and Indiana regional offices. We share the common goal of delivering our services ‘The McMahon Way,’ meaning we strive to build long-term client relationships by combining strong core values with a culture for success. To learn more, visit mcmgrp.com.