Our Leadership Team

Dedication to serving our policyholders starts at the top.
We strive to set standards of excellence for our entire organization.

 

Phil Gass
Chairman & Chief Executive Officer

Phil is a co-founder of Nassau and serves as chairman and chief executive officer. Learn more.

 

Jacqueline Merl Bamman
Chief People Officer

Jackie is responsible for leading Nassau's human capital strategy, focusing on initiatives that drive growth, innovation, culture, and the development and advancement of our employees.Learn more.

Thomas M. Buckingham, MAAA, FSA
Chief Growth Officer

Tom is responsible for developing and executing Nassau’s sales strategy for its insurance business, including all product development, distribution channels, marketing, branding, and leveraging digital tools to enable quick, easy and simple sales. Learn more.

Kostas Cheliotis
General Counsel & COO

Kostas, also known as Gus, is a co-founder of Nassau and is responsible for legal affairs, strategy and corporate functions. Learn more.

David E. Czerniecki, CFA
Chief Investment Officer

David is responsible for setting investment strategy and overseeing Nassau’s investment portfolio. Learn more.

Diane R. Ellsworth
Chief of Staff

Diane is responsible for ensuring strategic initiatives are on track, working with the executive team and all business and staff areas, and leads Nassau's communications and community engagement functions. Learn more.

Justin K. Mosbo
Chief Actuary & Chief Pricing Officer

Justin is responsible for all actuarial functions of Nassau along with all M&A transactions across insurance/reinsurance, asset management and distribution. Learn more.

Diana Piquette
Chief Financial Officer

Diana is responsible for the global finance function, providing oversight and leadership for financial planning, accounting and financial reporting, capital management, treasury, and tax. Learn more.

Vernon Young
Chief Risk Officer

Vernon is responsible for overall leadership and direction for enterprise risk management. Learn more.

Susan Zophy
Chief Service Officer

Sue is responsible for Nassau's Operations, encompassing all facets of service and policy administration including producer contracting, suitability, new business, in force management, post issue processing, claims and the customer service call center. Learn more.