Our Team

Robert J. Nardi

President and Executive Director

Bob Nardi is a Vice President with WSP, one of the largest consulting firms in the world. Mr. Nardi joined the company in 1980 and since that time has directed numerous planning, engineering, and other studies in support of major public works and infrastructure projects throughout the U.S. During his career, Bob has been involved in projects in Africa, Asia and the Middle East. He is an expert on federal and state environmental regulations and has led the planning and development of over 100 federal and state institutions in over 40 states and Puerto Rico during his 45-year career. Bob received a BA degree from Rutgers University (with honors) and a Master’s in City and Regional Planning also from Rutgers University and was the recipient of the inaugural Dean’s Medal of Merit from the Edward J. Bloustein School of Planning and Public Policy at Rutgers University. He is a New Jersey-licensed Professional Planner and a member of the American Planning Association. In 2018, he was selected to receive the Louis Berger Global Values Award for his exceptional leadership, mentorship and contributions to society. Since 2016, he has also led the Berger Charitable Foundation as its President and Executive Director.

Heather Unger

Vice President

Heather Unger is a Sustainability Project Director and Future Ready Program Lead for WSP USA. She is a LEED AP, Envision Sustainability Professional (ENV SP) and an Envision Verifier with 15 years of experience. Ms. Unger focuses on developing sustainability programs and projects for clients as well as internally for WSP. As the Future Ready Program Lead for WSP USA Ms. Unger supports and guide staff across the organization to better anticipate future conditions, develop industry leading innovations, and plan for the future by integrating future trends into WSP’s work.

Susana Raquel Berger

Secretary Treasurer, Director

Susana Raquel Berger has spent the last 15 years dedicated to political, labor, and community organizing in both the US and Panama. Her commitment to community empowerment led her to join President Obama’s campaign in 2008 and 2012, work in the healthcare division of the Service Employees International Union, and work alongside Panama’s Indigenous communities on programs to reduce maternal mortality and advocate for government resources. Susana now dedicates her efforts to fight health disparities and build health equity within communities of color in her role as a Regional Program Director with Made to Save, where she is in charge of managing grant programs while building relationships and trust with community leaders and activists in the communities hit hardest by the COVID-19 pandemic. In both her personal and professional life, Susana is passionate about supporting local movements and advocating for human and civil rights.

Betty Berger


Sofia Berger


Sofia Berger is a Senior Vice President and the National Business Line Leader for Transportation at WSP. In this role she oversees the strategic direction, business development performance, client management, and knowledge management of the U.S. transportation market, including highways, bridges, transit and rail, tunnels and aviation, as well as ports and marine. Sofia previously held several roles including Managing Director for the Latin American and the Caribbean Division at Louis Berger, an international consulting engineering organization, which was acquired by WSP in 2018. She has 20 years of infrastructure experience spanning project management of construction projects in the field and management consulting for private sector clients and governmental transportation agencies around the world. Ms. Berger is a third-generation engineer, following proudly in the footsteps of her father Fred Berger and grandfather Dr. Louis Berger. She has degrees in civil engineering and economics-operations research from Columbia University and a master’s in business administration from Harvard Business School. Ms. Berger has been on the BCF Board since 2017 and is deeply committed to the fulfillment of its mission. Ms. Berger also serves on the Board of the International Road Educational Foundation and serves in leadership positions with the American Road & Transportation Builders Association (ARTBA) and the Women’s Transportation Seminar (WTS) Greater New York Chapter.

Manuel Pérez Sierra


Manuel Pérez, graduate in mathematics from the University of Cantabria (Spain), Senior Vice President and Managing Director of WSP Spain, has more than 28 years of experience in the civil engineering sector; developing his professional work first at APIA XXI, later at Louis Berger, and finally at WSP after a double acquisition process.

Manuel has a very solid technical background in Transportation Planning, and vast experience in Business Management tasks, especially in Business Development, Internationalization Process and Strategic Planning.

During his career, he has been part of the management teams and member of the boards of directors of several companies in different industries, such as Civil Engineering, Energy or High Technologies.

Manuel Pérez usually combines his work within the engineering sector, with regular collaborations as speaker and professor of various Master's programs and different conferences at prestigious universities.

Proud BoD member of the Berger Charitable Foundation from September 2018.

Nick Ivanoff


Nick Ivanoff, PE, is the former president of Louis Berger's U.S. Transportation market segment, where he was responsible for expanding the company’s multi-modal transportation portfolio supporting public and private sector clients. He also chaired the company’s government relations committee. Mr. Ivanoff previously served as president and chief executive officer of Ammann & Whitney, a 69-year-old engineering and architecture firm, which merged with Louis Berger in 2016.

He is the past chairman of the American Road & Transportation Builders Association (ARTBA) where he also served as executive committee member on the ARTBA Board of Directors and chairman of its International Affairs Advisory Council. He has also served in a variety of other leadership roles at ARTBA and other professional organizations. Mr. Ivanoff also serves on the Civil Engineering Curriculum Advisory Council at his alma mater, the NYU Tandon School of Engineering. He is a registered professional engineer in 21 states and holds a Bachelor of Science in Civil Engineering and a Master of Science in Traffic Engineering and Transportation Planning, both from the Polytechnic Institute of Brooklyn (now the NYU Tandon School of Engineering).

Thomas G. Lewis


Tom Lewis is WSP USA’s senior executive in charge of Climate, Resilience & Sustainability (CRS) for WSP USA which strategically includes emergency and disaster management as well as the company’s trademarked “Future Ready” program. Under Tom’s leadership, CRS also provides the core team supporting WSP’s industry-leading global Environmental, Social, Governance (ESG) program. Tom is a licensed Professional Engineer (PE) in multiple states, holds a BS and MS in Civil Engineering and a Juris Doctorate with focus on environmental law, and is a board member for multiple organizations, including but not limited to the International Coalition for Sustainable Infrastructure and the Disaster Recovery Contractors Association. Prior to its acquisition by WSP, Tom served as a corporate board member and president of Louis Berger U.S. after leading its environmental, emergency management, sustainability, and climate resilience services working across the U.S. as well as globally.