About ENS

About ENS Resources: Federal Policy Experts Since 1986

ENS is a specialized firm whose work is driven by the experience and expertise of its principals. This is our story, our approach, and the people behind over four decades of federal legislative, regulatory and project management successes.

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Our Story

Founded in 1986 on a Single Focus

Eric Sapirstein founded ENS Resources in 1986 after holding leadership positions at the U.S. Environmental Protection Agency. From the start, the firm focused on one thing: federal legislative and regulatory affairs for public agencies, municipalities, coalitions, and the natural resources space.

For nearly four decades that focus has held. What began as a West Coast-focused practice has grown into a national footprint, and the firm is now expanding from federal advocacy into strategic planning, while preserving the close, principal-led relationships that long-tenured clients value.

Our Approach

A Principal-Led Firm

ENS is built so that clients work directly with the principals on every matter. We function as a senior extension of your team rather than a vendor, offering the direct partner-level engagement that often is not the circumstance in larger firms.

That means ongoing monitoring of the federal developments relevant to your organization, proactive communication that anticipates policy changes, and timely analyses and evaluations of policymaking coupled with sophisticated recommendations to reach a client's goals.

The United States Capitol dome against a blue sky

Our Team

The People Behind the Work

Founder & President

Eric Sapirstein

Eric Sapirstein founded ENS Resources in 1986 after holding leadership positions at the U.S. Environmental Protection Agency and Washington-based consulting firms. For nearly four decades, his firm has focused on legislative and regulatory affairs consulting for local and regional governments and national organizations serving the public interest. He brings deep expertise in federal water policy advocacy and strategic consulting, and remains directly involved in client work.

Executive Vice President

Sarah Sapirstein

Sarah Sapirstein serves as Executive Vice President of ENS and manages client priorities across water quality, infrastructure assistance, environment and public health, cybersecurity and resiliency policies and programs. She plays a central role in day-to-day client management and developing and executing client-specific federal policy strategy.

Senior Vice President

David R. French

David R. French serves as Senior Vice President. In this role, he works closely with clients to develop and implement strategies for legislative and regulatory programs and policy initiatives. His background spans water resources alongside transportation, economic development, infrastructure, homeland security, criminal justice, rural governance, and land use.

Senior Vice President

Roger Cockrell

Roger Cockrell serves as Senior Vice President of ENS, bringing federal service in the United States Senate, including work on the Energy and Water Development Appropriations Subcommittee as a subject matter expert for water resource issues. His Senate and appropriations experience is an asset for clients navigating the federal legislative process.

Eric Sapirstein, Sarah Sapirstein and David French of ENS Resources

Working With ENS

What It Means to Work Directly With Our Team

When you work with ENS, you work with the principals directly. You get senior counsel from people who have spent nearly four decades inside federal policy, not generalists learning your sector on your time.

See Our Work in Action

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