Longenecker & Associates, Inc. Email Format

Business Consulting and ServicesNevada, United States51-200 Employees

Longenecker & Associates, Inc. is a mid-sized professional services firm based in Las Vegas, Nevada, delivering mission-focused consulting to U.S. government programs. With more than three decades of experience, it supports the U.S. Department of Energy across national security, environmental remediation, scientific research, and energy initiatives, offering capabilities in mission assurance, project delivery, operations support, regulatory assurance, business strategy, and strategic communications.

It is described as a Geosyntec Company, reflecting alignment with Geosyntec’s environmental management and remediation capabilities and leveraging L&A’s past performance and personnel. In December 2025, Geosyntec Consultants, Inc. acquired L&A, a development that expands the combined organization’s footprint in government-focused and environmental services.

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