Longenecker & Associates

Longenecker & Associates (L&A) is a specialized technical and management consulting firm that provides support to the nuclear, environmental remediation, and national security sectors. Founded in 1989 and headquartered in Las Vegas, Nevada, the company primarily serves the U.S. Department of Energy (DOE) and its national laboratories, including Los Alamos and Savannah River. L&A's core capabilities include mission assurance, project delivery, regulatory compliance, and high-hazard operations support. In late 2025, the company was acquired by Geosyntec Consultants, a global environmental engineering firm, to expand its federal sector capabilities. L&A is recognized for its expertise in managing complex, high-risk projects and ensuring operational excellence within the federal energy complex.