About Us

MWH is a leading global project delivery company with a focus on water and energy. With the ultimate goal of delivering maximum value to clients and their local communities, MWH provides single-source, integrated design and construction services and a full range of project delivery methods. Incorporating industry-leading preconstruction services and safety practices, the Company’s multi-disciplined team of engineering and construction professionals delivers a wide range of projects, including new facilities, infrastructure improvement and expansion, and capital construction services.

MWH has some of the world’s leading innovators in water and wastewater technology with roots going back to 1820.  MWH currently includes Slayden in the northwestern United States and Methuen in the northeastern United States.

MWH operates as a stand-alone company and is headquartered in Broomfield, Colorado.

Methuen Slayden


Blair M. Lavoie, PE

A registered Professional Engineer and General Contractor, Lavoie is President and CEO of MWH, a top-tier, global construction company in the water and wastewater industry. Lavoie also provides direction and leadership to Slayden in the United States and MWH Treatment in the United Kingdom. Lavoie graduated from Harvard’s Advanced Management Program and Norwich University. He has been instrumental in shaping the construction industry’s adoption of alternative project delivery models, such as progressive design-build and CMAR.

Mark Crouser

Chief Business Officer (CBO) and Chief Financial Officer (CFO) joined MWH in February 2019. Mark has over 30 years of experience in finance, including negotiation, budgeting, internal audit, accounting and shared services, with more than 25 years working in finance in the construction industry. Mark spent 23 years with Balfour Beatty as the VP of Finance.

Mark Crowser

Jeffrey Garner, DBIA, PE, LEED AP

Garner is President of Slayden, an MWH subsidiary in the Northwest. Having over 30 years of experience in all types of industrial, mining, public and private sector construction along with  overseeing a number of U.S. Water programs, regions and departments, Garner has a proven history of assembling high-functioning teams and implementing winning business development growth strategies.

Philip R. Croessmann, J.D.

Croessmann is a Senior Vice President and the Global Director of Risk Management for MWH. In addition to being a licensed Attorney, Croessmann is a Registered Architect and General Building Contractor with more than 30 years of experience providing risk, commercial and claims management services. He is active in the American Bar Association’s Construction Forum. He also served as an arbitrator for the American Arbitration Association and is actively involved in alternative dispute resolution. 

Shannon Rowley

Shannon Rowley, SPHR, SHRM-SCP

Rowley is a Senior Vice President and Chief Human Resources Officer for MWH and is responsible for providing high-level consultation and implementation of MWH’s HR initiatives. She has been with MWH since 2005 and has over 19 years of experience in executing human resources strategies in alignment with operations and business objectives both in the US and internationally. Rowley began her career at MWH as the HR Director and VP for nearly seven years before transferring into MWH Global to lead the global HR operations. She received an MBA from Colorado State University and a BA in Business Administration from University of Colorado at Denver.

Marco Aieta, Ph.D., PE

Aieta is a Senior Vice President and Director of Corporate Business Development for MWH. Over his more than 30-year career, he has been responsible for the safe and economic delivery of water-related projects in the municipal, industrial, pharmaceutical, oil and gas, and mining market sectors worldwide. He is a recognized expert in water treatment process engineering and has been involved in the design of over 50 water, wastewater and water reuse treatment plants worldwide, in capacities up to two billion gallons per day, and over 160 pilot plant evaluations and demonstration projects.

Anthony Accradi

Anthony Accardi

Accardi serves as a Senior Vice President and District Director for the Eastern Region of the United States for MWH.  With over 25 years of experience in the design and construction of wet infrastructure projects, he has been responsible for all aspects of project execution for complex water and wastewater treatment project, pump stations, pipelines and tunneling projects.  He has delivered projects using all project delivery methods which include CMAR , Design Build, CM and hard bid.  Anthony applies strong technical knowledge and a TEAM attitude, to successfully lead project teams to meet client goals and deliver projects on time and within budget.

Michael Haarmann

Haarmann serves as a Senior Vice President and District Director for the Western Region of the United States for MWH. He is a seasoned water and wastewater professional with more than 24 years of experience in providing a full range of construction services to a broad change of clients. His extensive experience with alternate project delivery methods includes hard bid, design-build and CMAR of which he provided oversight as project executive or project manager on more than $1.5B of water/wastewater CMAR projects. Haarmann has served as project director, preconstruction manager, and project manager.

Russ Heinsen

Russ Heinsen

Heinsen is a Senior Vice President and Chief Information Officer for MWH responsible for IT operations, strategies, and solutions. Heinsen spent 30 years at Intel Corporation, growing with the company in positions of increased challenge and complexity, including various roles in finance, construction, software development, process re-engineering, and enterprise/solution architecture. He is a results-oriented technology leader with years of experience driving enterprise programs and technology solutions to deliver business value.

MWH Core Values

Company History

MWH, a leader in diversified project delivery, was formed from five water and energy companies with a combined 200-year history. We are a fully integrated one-stop shop for the full life cycle of any project. We maintain deep connections to the communities in which we work because we’re on the ground, actively designing and building globally. Our ongoing experience with both traditional and alternative project delivery models underscores our creative, client-by-client approach to projects. Our self-performance sets us apart from our competitors. We have the skills, experience and pride of workmanship to execute with unrivaled sophistication.

200 Years of Experience

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Our History

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