Tetra Tech announced two senior leadership appointments as part of its ongoing succession planning and internal talent development efforts. Effective with the start of fiscal year 2026, Roger R. Argus has been promoted to President of Tetra Tech, and Jonathan S. Weiss has been appointed President of the company’s Commercial/International Services Group (CIG).
Argus currently serves as Executive Vice President of Corporate Development and President of the Commercial/International Services Group. He brings four decades of professional experience, including more than 30 years with Tetra Tech. A chemical engineer by training, Argus has led multidisciplinary environmental, engineering, and management programs for federal, state, municipal, and private clients. He has also directed Tetra Tech’s mergers and acquisitions activities, overseeing the identification, negotiation, and integration of companies to expand the firm’s technical capabilities and client base.
In his new role, Argus will oversee Tetra Tech’s global operations, working with senior leadership and operational teams to maintain the company’s performance and growth trajectory.
Weiss, who has also spent more than 30 years with Tetra Tech, has led operations in both federal and commercial markets and played a key role in developing the company’s diversified energy practice. As President of CIG, Weiss will continue to lead global initiatives focused on the intersection of water and energy in the private sector.
“These appointments reflect the disciplined, forward-looking succession process we have undertaken,” said Dan Batrack, Tetra Tech Chairman and CEO. “Mr. Argus’ leadership, entrepreneurship and deep operational knowledge have contributed significantly to Tetra Tech’s record of success. Together with Tetra Tech’s executive management team, he will continue to advance our strategic objectives and industry-leading performance.”
“It is a privilege to serve as President of Tetra Tech,” said Roger Argus. “I look forward to building on our strong foundation of technical leadership, client trust, and collaboration. As we continue to expand globally, my focus will be on sustaining our exceptional performance and further advancing our ability to deliver innovative, science-based solutions for our clients worldwide.”
