Our team brings over 275 years of collective industry experience, with more than 11GW of renewable projects developed across the United States.

We have built a company with a wealth of experience and knowledge by bringing together successful energy developers from all over the world with accomplished financial and legal experts. We believe that Onyx is the hardest working team in the industry with one clear goal: to bring safe, sustainable energy to our clients.

Leadership Team

Mary Beth Mandanas

Mary Beth Mandanas

Chief Executive Officer

Buck Fletcher

Buck Fletcher

Chief Financial Officer

Patty Rollin

Patty Rollin

Chief Commercial Officer

Matthew Chen

Matthew Chen

Senior Vice President, Controller

Alfred Wang

Alfred Wang

General Counsel

John Fairbairn

John Fairbairn

Chief Administrative Officer


Chris Consiglio Vice President
Kevin Cox Vice President
Alex Crown Vice President
Martin Agrimis Associate
Oliver Martin Associate
Henri Rizack Associate
James Arcieri Analyst
Alejandra Macaya Analyst

Project Development

Noelle Paige Vice President
Cam Knowles Senior Associate
Nick Wigglesworth Associate


Laura Kaplan Senior Legal Counsel
Sean Rail Legal Counsel
Tom Attanasio Paralegal

Strategy and Finance

Chris Looram Vice President, Finance
Kevin Li Associate
Ryan Allen Associate

Engineering, Procurement and Construction

Gregg Cousoulas Executive Vice President, Operations
Scott Musich Vice President, Construction & Procurement
Thien Nguyen Vice President, Engineering
Hema Gupta Director, Procurement
Luke Nichols Director, Project Management
Erick Gonzalez Senior Interconnection Project Manager
Mustafa Akbari Project Engineer
Chris Ramos Construction Manager
Raif Armstrong Project Manager
Jaquay Brian Project Manager
Aaron Apmann Associate Project Manager

Asset Management

Greg Fuller Senior Vice President, Asset Management
Tyler Lagasse Technical Asset Manager
Sean McCormick Technical Asset Manager
Chris Haakinson Commercial Asset Manager
Ben Maritato Asset Management Analyst


Genneve Torres Accounts Payable Specialist
Delano Baird Senior Accountant
Karen Kim Senior Accountant
Toby Li Manager, Project Accounting
Brian Molnar Manager, Technical Accounting and Financial Reporting


Tung N’Vietson Vice President, Communications
Michael Richards Office Manager

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