Ms. Ladhani’s qualifications include her experience as a chief executive officer and chief financial officer of companies in the energy, chemicals and infrastructure sectors, where she was responsible for leading significant transactions and effectively allocating capital in capital-intensive industries, and her significant experience on the boards of publicly-listed companies, including serving as chair of various committees.
Michael E. McKelvy, age 66, Director since 2025
Mr. McKelvy has served as President, Chief Executive Officer and a member of the board of directors of McDermott International, Ltd (“McDermott”) since 2022. Prior to joining McDermott, Mr. McKelvy served as President and Chief Executive Officer of Gilbane Building Company (“Gilbane”) from 2014 to 2022, where he was responsible for developing and executing strategic growth and operational plans. Before joining Gilbane, Mr. McKelvy worked at CH2M HILL Companies, Ltd (“CH2M”) for 26 years, where he advanced through increasingly significant general management and executive roles, including Chief Delivery Officer, where he was responsible for global operations, strategy and delivery. Mr. McKelvy spent his early career in operations as an architect and project manager at C.H. Guernsey & Company and Lockwood Greene, which became part of CH2M.
Mr. McKelvy previously served on the board of directors of RPS Group PLC from 2018 to 2023, Gilbane Inc. from 2017 to 2022 and CH2M from 2007 to 2014. Mr. McKelvy holds a Bachelor of Science degree in Environmental Design from the University of Oklahoma in Norman, Oklahoma and a Bachelor of Architecture degree from Louisiana Tech University in Ruston, Louisiana.
Mr. McKelvy’s qualifications include his more than three decades of experience in the global engineering, procurement and construction sectors, including serving diverse clients in connection with large-scale infrastructure, environmental and transportation projects, his experience in leadership roles with oversight of risk, quality, safety, security, procurement, project controls and design and his prior board experience for both publicly-listed and private companies of relevant scale and sector.
Jürg Oleas, age 68, Director since 2025
Mr. Oleas most recently served as Chief Executive Officer of GEA Group AG (“GEA”), a position he held from 2004 to 2019. Prior to serving as Chief Executive Officer of GEA, Mr. Oleas held several other positions on GEA’s Executive Board, dating back to when he first joined the company in 2001. Before joining GEA, Mr. Oleas spent nearly twenty years at ABB and the Alstom Group, where he served in a variety of management positions including President, Alstom Switzerland and Managing Director, Combined Cycle Gas Turbine Plants.
Mr. Oleas served as a member of the Holcim Board of Directors from 2014 to 2015 and from 2016 to 2025, where he served on the Audit Committee and the Nomination, Compensation, and Governance Committee. From 2020 to April 2025, Mr. Oleas served as Chairman of the Board of Directors of HOCN AG, where he also served as a member of the Audit Committee and the Nomination and Compensation Committee. In addition, Mr. Oleas has served as a member of the board of directors of RUAG International Holding AG since 2011, where he currently serves on the Audit Committee and the Nomination and Compensation Committee. Mr. Oleas holds a Master of Science degree in Mechanical Engineering from the Swiss Federal Institute of Technology in Zurich, Switzerland.
Mr. Oleas’s qualifications include his experience as a public company chief executive officer from the industrial manufacturing sector and running businesses of global reach and scale, his significant experience on the boards of publicly-listed companies, including as chair, and his understanding of the Amrize Business.
Robert S. Rivkin, age 65, Director since 2025
Mr. Rivkin has served as Senior Vice President and Chief Legal Officer for United Airlines Holdings, Inc. (“United”) since 2019, where he leads United’s legal department, including the corporate, securities, finance, commercial, litigation, government contracts, intellectual property, antitrust, environmental, employment and international groups. Mr. Rivkin is also responsible for security, facilitation, compliance, ethics and investigations. Prior to joining United, Mr. Rivkin served as deputy mayor of the City of Chicago from 2017 to 2019, where he oversaw the implementation of Mayor Rahm Emanuel’s key priorities across city departments and agencies, focusing his efforts on economic development, job creation and retention and infrastructure. Prior to that, Mr. Rivkin served of counsel at Riley Safer Holmes & Cancila LLP from 2016 to 2017 and as Deputy General Counsel of Delta Air Lines, Inc. (“Delta”) from 2013 to 2016, where he was responsible for addressing governmental regulation and oversight in the U.S. and abroad, as well as litigation, antitrust, employment and real estate legal issues. Before joining Delta, Mr. Rivkin served