Who We Are

Brendan Neagle has more than two decades of leadership experience in the renewable energy industry, spanning project development, operations, M&A, and finance. Before joining Prospect14 as President in 2025, he served as Executive Vice President of Project Finance at New Leaf Energy and spent nearly 16 years at Borrego Solar, where he held senior roles including Executive Vice President of Project Finance and Chief Operating Officer. He began his solar career in 2002 at SPG Solar, where he led sales and market development.
Throughout his career, Brendan has focused on the growth of the individual contributor. Through an acute focus on people and teambuilding, Brendan hasconsistently driven profitable growth while leading the development of lean management systems and a culture of continuous improvement.
Brendan holds a BA in American Studies from Brown University.

Prior to joining Prospect14 in 2026, Keith served as President of Independence Solar in New Jersey, which he founded in 2007. Keith strategically led the company’s full-service, high-quality commercial solar focus while expanding its presence throughout the Northeast, managing business development initiatives and partnerships with third parties.

Keith has over 19 years of experience in solar development, including completing one of the largest roof-top solar installations in the country, the 10.1 MW Holt Marine Terminal in Gloucester City, New Jersey.

Prior to Independence Solar, Keith worked for Allco Renewables, US Solar Finance, and Verterra Renewables, managing the financial analysis and development of over $300 million of solar, wind, and biomass projects. Keith holds a B.S. from the Wharton School at the University of Pennsylvania and an M.B.A. from MIT, where he focused on the economics of solar.

Greg Ruth most recently served as Vice President of Project Finance at Ecoplexus, Inc., which develops, constructs, owns and operates renewable energy projects at utility scale in the U.S., Mexico, Japan, and Southeast Asia. The company has developed, financed and constructed over sixty projects to date.
For Ecoplexus, Greg managed the project finance team, U.S. project financings, and project dispositions.

Prior to joining Ecoplexus, Greg was a Principal at Hawk Hill Group, which finances renewable energy assets. There, he invested in and lent to renewable energy projects and platforms. Prior to Hawk Hill, Greg served as Director of Corporate Development for Renovate America, a growth-stage, technology-enabled solar and energy efficient financing company with over $100M of capital. Working on the Corporate Development team, his responsibilities included mergers and acquisitions, strategic finance, and partnerships. Prior to Renovate America, Greg worked for Advanced Microgrid Solutions as Director of Finance; with City National Bank as Vice President; with SOLON Corporation as Director of Project Finance; with SunPower Corporation as Utility & Power Plants Associate; with The JBG Companies as Investment Associate; and with Overseas Private Investment Corporation as Public Affairs Specialist.

Greg holds an MBA from the Haas School of Business at University of California, Berkeley, and a BA in Science, Technology & Society from Stanford University. He is also a Chartered Financial Analyst.

Justin Kastner brings over 20 years of leadership in land acquisition, right-of-way management, and renewable energy development to his role as Vice President of Project Development at Prospect14. He heads site origination, land strategy, and permitting for utility-scale solar, storage, and infrastructure projects, partnering with executive leadership to grow the company’s development pipeline and deliver value across financial, community, and environmental dimensions.
Previously, Justin held development leadership roles at ReneSola Power (NYSE: SOL) and CanACRE (U.S.A.) Inc., where he managed land development and permitting for more than 750 MW of solar and wind projects. He notably secured 1,700 acres for 130 MW in New York within two months, conducted due diligence for 600 MW of solar assets in Pennsylvania, and facilitated successful township-level project approvals. Earlier in his career, he advanced land acquisition and right-of-way strategies for TransCanada, Columbia Gas, and Buckeye Pipeline, achieving multi-county permitting milestones with significant cost reductions.
Justin is a Certified Professional Landman (CPL) and has held leadership positions with the American Association of Professional Landmen and the International Right of Way Association. He earned an MBA from Bloomsburg University and a B.S. in Accounting from Penn State University. Justin is based in Williamsport, Pennsylvania, where he also serves as Township Supervisor for Old Lycoming Township.

Before co-founding Prospect14, Carl J. Jackson most recently led project origination and business development for Cypress Creek Renewables, where he developed, took through EPC, and financed solar energy projects. Since entering the solar industry in 2010, Carl has contracted and financed 633MW of projects in 10 states.

Prior to Cypress Creek, Carl spearheaded growth as Sol Systems’ Director of Project Finance, leading Northeast project origination, liaising with the company’s investment team, developers, and sponsors seeking capital. At Sol Systems Carl’s efforts resulted in the origination and contracting of 125MW in projects sold to funding partners, including the notable 8MW Churchill project in Mayland, which was closed and financed as fully merchant. Carl has self-developed contracted offtake with Fortune 1,000 corporations and sold to private buyers resulting in >10MW contracted and >$20M of revenue.

Prior to entering the solar industry, Carl cofounded a scholastic products company, Graduation Station, which he sold in 2010, and worked in financial management and energy trading for Morgan Stanley Smith Barney.

Carl received his BS from the Smeal College of Business at Penn State University in Business Logistics, Supply Management & Finance. He holds Series 7 & 63 trading licenses. At Penn State Carl was a four-year scholarship athlete and co-captain of the basketball team.

Before co-founding Prospect14, Geoff Underwood most recently served as VP of Origination for Strata Solar, where he managed PJM, NYISO, MISO, ERCOT and SE ISO power marketing. Previously, Geoff developed utility-scale solar projects for 174 Power Global (a member of the $100 billion Hanwha Group). Since 2008, Geoff has contracted more than 500MW of projects in 12 states, and developed a recognized specialization in brownfield projects, closing the first utility-scale solar project constructed on an active Superfund/CERCLA site (the 10.86MW Maywood Solar project), resulting in receipt of the first-ever EPA RENEW Award in 2015.

Prior to 174 Power Global, Geoff managed solar asset acquisitions for Constellation Energy (now Exelon) and co-founded and led business development for a Pennsylvania-based startup solar development firm, leading growth to >$50 million. Prior to his work in solar energy development, Geoff launched renewable energy equities coverage at FBR Capital Markets in 2007, and completed an eighteen year career in Washington, DC with significant work in energy policy and economics, business and venture development, and with federal agencies, Congress, and the White House.

Geoff received his BA from the University of Florida and his MBA from the Robert H. Smith School of Business at the University of Maryland.

Prior to co-founding Prospect14, Charles A. Silio most recently served as VP – Strategy, Corporate Development and Marketing for Agility Fuel Solutions, the leading global manufacturer of clean fuel solutions for heavy-duty commercial vehicles. For Agility, he led M&A and strategic partnerships, global marketing, and internal business transformation initiatives including ERP system implementation.

Prior to joining Agility in 2013, Charlie was a Principal with Element Partners, a private equity firm focused on energy and industrial technology businesses. His investments included Agility, where he served on the board of directors and audit committee, and TPI Composites (Nasdaq: TPIC), a leading manufacturer of wind turbine blades and composite vehicle structures. Prior to joining Element he worked for four years with D. E. Shaw & Co. in New York and London in credit opportunities, special situations, and private equity; with GTCR in Chicago, where he made control private equity investments in transaction processing, business services, and energy companies; and as a technology and telecom investment banker at Lazard.

Charlie holds an MBA with honors from the University of Chicago Graduate School of Business, an MSc. with distinction in Politics of the World Economy from the London School of Economics, and a BSE in Civil Engineering and Operations Research with high honors from Princeton University. He is a Certified Public Accountant, a CFA charterholder, and a PMI Project Management Professional.