Our forward-looking leadership team is made up of dedicated, focused, and experienced professionals. Working with each other and with our worldwide workforce, their knowledge and experience come together to create positive, lasting changes for businesses, communities, and our planet.
Group Leadership Team
Tim Metcalfe
Group Commercial Director
As Group Commercial Director, he is using his extensive experience and expertise to drive the Group’s commercial strategy forward and assists on driving key growth initiatives.
James Hepton
Group Marketing Director
James joined Envirogen in early 2022 and is responsible for marketing activities across the Group business, having run marketing departments for many years.
Ross Dummett
Group Contracts Director
Ross joined Envirogen in late 2022 following a 30-year career in design and build contracting across Water, Water recycling, Energy, Solid Waste and Civil Engineering.
Regional Senior Management – North America
Bobb Campbell
Chief Operations Officer (Service and Products), North America
Bobb has more than three decades of water and industrial wastewater industry experience, having previously held several senior executive positions, with experience in fabrication, service and operations, and sales-focused roles.
Todd Webster
Vice President Sales
Todd brings more than 25 years of experience in all aspects of biological and physicochemical water treatment system design, installation, and operation at the pilot- and full-scale levels throughout North America and the world.
Paul Togna
Vice President Sales
Paul is responsible for the overall successful conduct of projects and business in the NA Power sector, including Envirogen’s CCR and FGD-related efforts, as well as for coordination of efforts with Envirogen’s partners in Power.
Regional Senior Management – UK & Europe
Bill Denyer
Chief Executive Officer,
UK & Europe
Trained in mechanical engineering, Bill’s career spans over 20 years of designing and building water processing solutions across the UK and European markets.
Ian Pearson
Operations Director,
UK & Europe
Our UK operations team is led by Ian, a role he took on in 2020 alongside his continuing leadership of the service, project and manufacturing teams.
Bart Scholten
Group Business
Development Manager – PLF
Having spent over 30 years designing and delivering process filtration projects, Bart is a world-leading specialist, often speaking at key industry events.
Joe Higgins
Group Chief Executive Officer
Joining Envirogen in 2021 following a 25-year career in the water, energy, and hazardous waste industry, Joe is Group CEO and CEO for North America. Joe has overall responsibility for operations in North America, the UK, and Europe, as well as strategic planning and growth initiatives. He is committed to sustainably growing the organisation through synergetic strategic partnerships and delivering innovative, competitive, and sustainable solutions for our customers.
Martin Holt
Group Finance Director
Martin joined Envirogen in early 2024. His role as Group Finance Director provides a vital link between the Envirogen Group, its North American sister company, Envirogen Technologies Inc. and key stakeholders. With a proven history of navigating complex financial landscapes and implementing impactful solutions, Martin is adept at driving positive change. He has expertise in managing businesses of varying sizes and spearheading major financial initiatives.
Tim Metcalfe
Group Commercial Director
Tim is now key member of the Senior Leadership Team. As Group Commercial Director, he is using his extensive experience and expertise to drive the Group’s commercial strategy forward and assists on driving key growth initiatives. Previously, Tim was the Group Finance Director for the Envirogen Group for 7 years and prior to that he qualified as a Chartered Accountant, had 12 years at KPMG and then a further decade of Board experience across a range of industries.
James Hepton
Group Marketing Director
James joined Envirogen in early 2022 and is responsible for marketing activities across the Group business. James has run marketing departments for both SMEs and large businesses at a senior level across numerous industries, including electronics, telecoms, manufacturing and construction, focusing on improved efficiency and performance with internal and external marketing resources and delivering a solid return on marketing spend.
James believes in presenting consistent, quality branding across the organisation and using technology and innovation to demonstrate our capabilities and communicate with our customers.
Bill Denyer
Chief Executive Officer, UK & Europe
Bill has over 25 years’ of experience in the water treatment industry. After initially starting with GE within the mobile water sector he went on to work on the installation and commissioning of build own operate maintain systems before starting his first role with Envirogen as Process & Systems specialist. During the initial period of his Envirogen career Bill specialised in the brewing and soft drinks industries while developing a detailed understanding of hollow fibre membrane applications as he supported clients across multiple continents. In recent years Bill took his experience into the Commercial arm of the Envirogen Group before moving on to the Executive team during 2018.
Scott Malvenan
Group Non-Executive Chairman
Scott has extensive experience in the construction, electronics, textiles, furniture and water engineering industries. He was previously CEO of Envirogen Group from 2017 to 2021 and is now Group Non-Executive Chairman.
Scott has a strong focus on building shareholder value, creating sustainable competitive advantage and exceeding customers’ expectations. He has experience in significant change management, and financial and operational performance gained in international markets in varied ownership structures, including plc, joint venture, private equity, and other financial institutions.
Mike Stark
Chairman, North America
Mike Stark is the Chairman of our North American business. He was one of the Founders of Envirogen Technologies Inc., in October 2009, which is now Envirogen Group, LLC. Prior to Envirogen Mike was President and CEO of Veolia Water North America and before that, he was President of US Filter Operating Services Inc. He began his career in 1965 and was one of the original members of Calgon Adsorption Systems which became Calgon Carbon, Inc. Mike believes a Solution Provider should be willing to warranty the performance, reliability and operating expectations associated with the projects it performs.
Ross Dummett
Group Contracts Director
Ross joined Envirogen in late 2022 following a 30-year career in design and build contracting across Water (municipal and industrial), Water recycling, Energy, Solid Waste and Civil Engineering. Ross is the Group Contracts Director with responsibility for the Project Management Office (PMO) and Engineering in the UK, including supporting the North American business. Passionate about projects, he is committed to the right-first-time mantra to deliver positive outcomes for our customers and end users.
Ian Pearson
Operations Director, UK & Europe
Our operations team is led by Ian, a role he took on in 2020 alongside his continuing leadership of the service, project and manufacturing teams. This integrated approach enables consistent attention to client expectations throughout the lifecycle. As Operations Director, Ian seamlessly integrates his 20 years of project execution experience, detailed knowledge of the client delivery cycle and passion for delivering success on time and on budget.
John Jepson
Commercial Director, UK & Europe
John has over 20 years of operational and commercial experience within the industrial water treatment industry. John is responsible for the commercial development of the UK business. He has a passion for constantly improving clients’ experiences and the value they gain from Envirogen’s solutions. He has also worked with private equity-backed companies, developing, and implementing sustainable growth plans.
Bart Scholten
Group Business Development Manager – PLF
Having spent over 30 years designing and delivering process filtration projects, Bart is a world-leading specialist, often speaking at key industry events. As Group Business Development Manager, he focuses on growing the process filtration business with a focus on pressure leaf applications. Bart supports the sales team through development and coaching so they can provide optimal solutions for clients.
Bobb Campbell
Chief Operations Officer (Service, Operations, and Products), North America
Bobb has more than three decades of industrial water and wastewater industry experience, having previously held several senior executive positions, with experience in fabrication, service and operations, and sales-focused roles. Bobb has over 22 years of managerial experience and enjoys building, coaching, and mentoring people to their greatest potential. He is responsible for strengthening Envirogen’s regional service lifecycle and support functions, as well as harnessing product and technology transfer between Envirogen’s European and North American markets to help build a single global water solution.
Todd Webster
Vice President Sales
Todd brings more than 25 years of experience in all aspects of biological and physicochemical water treatment system design, installation, and operation at the pilot- and full-scale levels throughout North America and the world. He is responsible for all aspects of company initiatives in the NA Remediation, Food & Beverage, and Mining sectors. He maintains operating budgets, staffing, and commercial aspects for all his market sector projects and provides technical process engineering support to the company for the entire treatment system product line. He earned his PhD in Civil/Environmental Engineering and is a registered Professional Civil Engineer in California. Todd very much enjoys working with a variety of clients, specifically bringing forward and implementing innovative and cost-effective environmental solutions for the treatment of emerging contaminants of concern.
Paul Togna
Vice President Sales
Paul is responsible for the overall successful conduct of projects and business in the NA Power sector, including Envirogen’s CCR and FGD-related efforts, as well as for coordination of efforts with Envirogen’s partners in Power. Paul has over 30 years of experience with water treatment technologies and projects, including new systems development, start-up, and support of operating systems, and managing responsibilities for process engineering and biosystem optimization. Paul enjoys developing lasting relationships with his customers and partners and providing sustainable treatment solutions. He has both B.S. and PhD degrees in Chemical Engineering.
Amy Gunter
Chief Financial Officer – North America
Joining Envirogen in 2022 following over 20 years in travel and service markets, Amy is the CFO for North America. Amy supports the North American and Group Senior Management by overseeing North American finance operations and identifying opportunities to drive business growth.
Amy has spent years working in finance at service companies such as Total Airport Services and Servisair, and has seen them through periods of significant growth in both revenue and headcount.
Paul Togna
Vice President Sales
Paul is responsible for the overall successful conduct of projects and business in the NA Power sector, including Envirogen’s CCR and FGD-related efforts, as well as for coordination of efforts with Envirogen’s partners in Power. Paul has over 30 years of experience with water treatment technologies and projects, including new systems development, start-up, and support of operating systems, and managing responsibilities for process engineering and biosystem optimization. Paul enjoys developing lasting relationships with his customers and partners and providing sustainable treatment solutions. He has both B.S. and PhD degrees in Chemical Engineering.
Mike Stark
Chairman, North America
Mike Stark is the Chairman of our North American business. He was one of the Founders of Envirogen Technologies Inc., in October 2009, which is now Envirogen Group, LLC. Prior to Envirogen Mike was President and CEO of Veolia Water North America and before that, he was President of US Filter Operating Services Inc. He began his career in 1965 and was one of the original members of Calgon Adsorption Systems which became Calgon Carbon, Inc. Mike believes a Solution Provider should be willing to warranty the performance, reliability and operating expectations associated with the projects it performs.