Leadership Team

Experienced solar executives leading the next generation of innovation

Scott Graybeal


Scott Graybeal is a veteran executive who led the Energy Solutions Segment at Flex Ltd (NASDAQ: FLEX), a $2B division within the company serving the solar, energy storage, and LED lighting markets. Under his leadership, Flex Energy became the third largest producer of PV modules outside of mainland China, and patented several key solar manufacturing innovations.

Scott’s career spans several industries from construction tech to solar to semiconductors. Before joining Caelux, Scott was COO of Veev Group & CEO of Veev Build and has held key leadership roles at Intevac, Amonix, Oerlikon Solar, Veeco Instruments, Applied Materials, and General Electric. Scott has guest lectured on renewables and entrepreneurship at Carnegie Mellon and Georgetown.

He served with distinction as a nuclear submarine officer and is a certified nuclear engineering officer by the Departments of the Navy and Energy. Scott earned his MBA from Thunderbird School of Global Management and his BS in Chemistry from UC San Diego.

John Iannelli

President & Founder

John Iannelli is an experienced technology executive who started Caelux in 2014 with the goal of improving the performance of crystalline silicon modules using nanomaterials. Prior to founding Caelux, he worked in venture capital at Khosla Ventures (Menlo Park, CA) focusing on investments in renewable energy generation and storage, smart grid, and solid-state lighting. He has served as the Corporate Chief Technology Officer and Solar General Manager at Emcore Corporation, and began his career as a Research Scientist, and later Engineering Director at Ortel Corporation, Agere Systems, and Lucent Technologies.

John has served as a visiting faculty member at Caltech and has authored numerous scientific research papers, patents, and industry review articles on semiconductor device physics, laser and optical technologies, and solar energy.

He has also been the recipient of fellowships and awards from NATO international research programs and the American Mensa Society. John received his PhD from the California Institute of Technology, his MBA from USC’s Marshall School of Business and his BS from Rensselaer Polytechnic Institute.

Ben Heng


Benjamin Heng drives the process/equipment integration for scalable manufacturing and operations at Caelux. He has successfully brought two companies (Silevo/Solarcity) to acquisition and currently advises technology startups like Alpha10X, CherryLabs, and SpartaScience.

As the former head of Solar Product Engineering & Operations at Tesla / Solar City, Ben led design, development, pilot, and transition to manufacturing of their most cutting-edge products including the solar roof. He holds more than 65 patents in various disciplines from biotech, to transistor technology, to solar.

Before this, he was part of Intel Device Integration and Process Engineering groups. Ben is a graduate of the University of Illinois at Urbana-Champaign, where he received his Ph.D. in electrical engineering with a focus in device physics and nanobiotechnology.