Meet the Team

Leadership Team

Josh Howes

Chief Executive Officer (CEO)

David Diaz

Chief Strategy Officer (CSO)

Chris Nuttle

Chief Financial Officer (CFO)

Nelson Marin Headshot

Nelson Marin

Chief Technology Officer (CTO)

Kelly Moffett

Chief Operating Officer (COO)

Engineering & Tax

John Kapral, JD, CPA, LLM

Senior Director, Renewable Energy Tax Incentives & Credits

Brian Montenegro headshot

Brian Montenegro, P.E.

Executive Director, Energy Engineering

Steven Nuttle

Executive Director, Energy Tax Engineering

John Robinson Headshot

John Robinson ll

Executive Director, Residential Energy Programs

Mazu Lopez

Senior Engineering Manager

Otoniel Cantillo Ulloa

Software Engineer

Daniel Davila

Project Manager

Dylan Ganci

Engineering Operations Coordinator

Vincent Casella

Associate Project Engineer

Chad Shafer

Project Engineer

George Essler

Project Engineer

Neal McKiernan

Project Manager

Gabriel Powell

Project Manager

Client Services

Matt Sullivan

Director of Client Relations

Peter Randolph

Vice President, ESCO Partnerships

Marco Ferreira

Director of Affordable Housing Programs

Weston Lustig

Director, Business Development – Energy Tax & Engineering

Jon Leite

Director, Business Development – CPA & Real Estate

Pete Jones

Energy Tax Consultant

Steve Nanos

Vice President, CPA & Real Estate Partnerships

Jann Pierce

Senior Energy Tax Consultant

Mark Rossetti

Senior SALT Consultant

Gregory Hawkins

Energy Tax Consultant

Sales & Marketing

Julian Martinez

Director of Marketing

Yuliia Tsybka

Sales Operations Manager

Administration

Marla Lopez

Quality Assurance Analyst

Renee Yvette

Accounting Coordinator

Makenzie Howes

Administrative Coordinator

Latest Blogs & News

Walker Blue Supports Congressional Effort to Extend 179D and 45L Energy-Efficiency Incentives

179D, 179D Updates, 45L Credit, Blog, EPAct 179D IRS Tax Deduction, In the News, News, One Big Beautiful Bill, Section 179 Tax Deduction | June 30, 2026

Campus geothermal energy system showing underground heat exchange loops serving multiple educational buildings, illustrating how district and campus geothermal projects can support sustainability goals and potentially qualify for federal clean energy tax incentives.

Can District and Campus Geothermal Projects Qualify for the Federal ITC?

Campus Geothermal, District Geothermal Systems, Geothermal Tax Credit, ITC | June 15, 2026

Court Vacates IRS Notice 2025-42: What Solar Developers Need to Know Before July 4

Court Vacates IRS Notice 2025-42: Five Percent Safe Harbor Restored for Now

Blog, In the News, News, Safe Harbor | June 7, 2026

Geothermal Central plant

Case Study: LEED EA Energy Modeling for a $90M Geothermal Central Plant: University of Louisville Speed School

Blog, Case Study, Energy Engineering, Energy Modeling, LEED | May 26, 2026

Walker Blue Applauds Rep. Brian Fitzpatrick’s Introduction of the American Energy Dominance Act

179D, 179D Updates, News, Section 179 Tax Deduction | April 27, 2026

Exhibiting: CASBO CON, March 31 – April 1

Industry Events | March 24, 2026

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