iconThe HOMER Energy Team

The core team that developed the HOMER software at NREL migrated along with the software code to HOMER Energy. In addition, the team adds new professionals with experience in renewable energy, software development, management, marketing, and entrepreneurial ventures.



Analysis and Training

Software Development and IT

Peter Lilienthal

Peter Lilienthal, Ph.D., Chief Executive Officer

Dr. Peter Lilienthal is the original developer of the HOMER® software and founded HOMER Energy in 2009 to enhance and commercialize the software. He has a Ph.D. in Management Science and Engineering from Stanford University.  Peter has been active in the field of renewable and distributed energy and energy efficiency since 1978. Before founding HOMER Energy, he was president of Green Island Power, which provided analytical services for renewable and distributed power projects. From 1990-2007 he was Senior Economist with the International Programs Office at the National Renewable Energy Laboratory. His experience has included project development of distributed power projects, designing and teaching courses at the university level, and consulting to industry and regulators. His technical expertise is in utility modeling and the economic and financial analysis of renewable and distributed power projects. He was the lead analyst and one of the creators of NREL’s International and Village Power Programs. [top]

Marilyn Walker

Marilyn Walker, Ph.D., Chief Operating Officer, Director of Academic Relations

Dr. Walker is a serial entrepreneur and experienced technologist. She started her career in academia, earning a Ph. D in Biology from the University of Colorado and publishing over 50 technical publications on modeling and environmental analysis. In the university setting, she raised over 12 million dollars to make her programs financially sustainable and gained valuable knowledge in the fields of software, databases, modeling, and analysis. After 20 years in academia, she became an entrepreneur by purchasing, managing, and selling a successful business, PlayFair Toys. She founded and built two e-commerce companies, and has led multiple international and multidisciplinary teams. Dr. Walker brings her unique, in-depth experience in environmental systems and business operations to her role as COO. [top]

Howard Alt

Howard Alt, Chief Technology Officer

Howard Alt brings more than 20 years experience in software and systems to his position as the Software Project Manager at HOMER Energy. Over his career he has worked in businesses from startups to Fortune 500 as a software engineer, QA engineer, engineering manager, product manager, chief technologist, entrepreneur and CEO. [top]

Andy Kruse

Andy Kruse, VP for Business Development

For nearly 30 years Andy Kruse has been involved in international marketing, sales development of certification standards and public policy. As a co-founder of a Start-up clean-tech company in Arizona, he built Southwest Windpower into an internationally recognized brand within the clean energy industry which sold more than 180,000 wind generators worldwide. He has traveled to and worked directly with potential distributors in 72 countries. Later he joined Endurance Wind Power and established one of the first small wind leasing programs in the U.S. Most recently he worked as a consultant to a number of wind and solar companies in Europe where he has lived the last year.

Andy’s passion for international sales has been recognized numerous times by various agencies and trade associations over the years. He was awarded Exporter of the year by the US Export-Import Bank, the Small Business Administration and he received the President’s E award from the US Department of Commerce. The American Wind Energy Association also awarded him Small Wind Person of the Year in 2009. [top]

Diane Rieck

Diane Rieck, Controller

Diane has long been involved and interested in the environmental sector and serves as HOMER Energy’s Controller. She was a founding member of Wildlands Restoration Volunteers in Boulder, later taking over their accounting operations and in addition has worked with multiple local accounting clients over the last decade. Previously, Diane worked for American Express in New York City. She has an MBA from New York University and was an active volunteer for NRDC. Diane loves balance, a theme she sees compatible and necessary in both accounting and nature. She enjoys biking, hiking, gardening, knitting, cooking, reading, the list goes on and on… [top]

John Glassmire

John Glassmire, Director of Energy Engineering

John Glassmire is a globally-minded engineer who has worked across a wide-range of infrastructure projects. He has interests in sustainable design, renewable energy, project management, and international development. John’s undergraduate background is in mechanical engineering. After earning his BS from Rice University and his Masters from Northwestern University, he worked for 2 years at Sargent & Lundy, a major energy design and consulting firm in the US. Subsequently, John worked as a consultant in energy and water infrastructure at the Institute for Sustainable Futures in Sydney, Australia. [top]

David Rinck

David Rinck, Renewable Energy Engineer/C++ Programmer

David Rinck develops the analytical tools and methods within HOMER’s modeling engine. A mechanical engineer and C++ programmer, David's research and professional experience in data analytics and controls ranges from projects in solar thermal concentration to critical care medical devices. He has a strong interest in renewable energy, micro-grids and their potential impact in the developing world. He received his Master's in Mechanical Engineering with a concentration in energy systems at Columbia University, where he worked with the Earth Institute's Millennium Villages project. [top]

Jonathan Awerbuch

Jonathan Awerbuch, Energy Engineer

Jonathan supports the software development team by maintaining the quality, accuracy, and documentation of new releases of the HOMER software. Jonathan received the A.B. in Engineering Sciences and the M.S. in Mechanical Engineering from Dartmouth College in 2007 and 2009 respectively. He received the M.Eng. from Yale University in 2010. His fervent interest in the impending energy/environmental meta-crisis motivated publications and research including power electronic and ultracapacitor systems to improve electric vehicle efficiency, photovoltaic performance in the presence of output ripple and noise, and energy efficient electrothermal deicers, particularly for commercial wind turbines. [top]

Aarabi Madhavan

Aarabi Madhavan, Renewable Energy Analyst

An ardent fan of Marvel's Iron Man, Aarabi aims to use engineering to solve one of the world’s growing concerns: access to clean and cheap energy. Realizing that solving the energy crisis requires an understanding of technology, policy, and people, she pursued a graduate degree in Sustainable Energy from Columbia University. At Columbia, she created business models for "bottom-of-pyramid" energy entrepreneurs, consulted on energy storage strategies for a Fortune 200 energy company, studied global energy policies, and worked as a graduate researcher at Sustainable Engineering Lab. Her graduate research involved developing a heuristic Geo-spatial network algorithm for grid connection in Sub-Saharan Africa. As a Renewable Energy Analyst at HOMER Energy; she works on consulting projects, creating and analyzing models for rural electrification, and also writes code to develop and test new features of the HOMER PRO software. She is learning Swahili and hopes to lead rural electrification projects in Sub-Saharan Africa and Asia. [top]

Aleph Baumbach

Aleph Baumbach, Sales and Support Engineer

Aleph Baumbach graduated with two degrees: one in engineering (ABET accredited) and one in psychology from Fort Lewis College in Durango, CO. He believes that while engineering can help us improve the living systems and products that make our civilized world, that if we are to change to a more sustainable approach, change must arise from within. This is why he decided to pursue a double major in psychology – to study the inner human world – and engineering – to study how we can generate solutions to a variety of problems. As part of his interests in renewable energies, the environment, and sustainability, he served in the board of directors for the Environmental Center in Durango, CO for four years. He also was part of a project to bring potable water and a sanitation system for an indigenous village in Ecuador and in Laos with Engineers Without Borders. With his multi-cultural background, Aleph also speaks Spanish, Portuguese, and some German, which he uses to help HOMER’s customers worldwide with their technological issues as Support Engineer and Client Services Specialist. [top]

Andrew Flynn

Andrew Flynn, Sales and Support Engineer

Andrew has a diverse educational background, tailored to help solve modern issues in renewable energy technology. Equipped with undergraduate studies in environmental economics, public policy, and business at the University of Connecticut followed by a master’s degree in Renewable Energy Development from Heriot-Watt University’s Orkney Islands Campus, Andrew spends his days on support and business development efforts. Although he misses the stormy Scottish seas from his grad school days, if there is one thing Andrew has learned, it’s to take advantage of the sun. You can find him playing in the mountains or out on the soccer pitch. [top]

Osie Adelfang

Osie Adelfang, Microgrid News & Insight Editor-in-chief

Osie has been a writer, editor, and marketing professional for two decades, with much of that time spent in the technology and software industry. At HOMER Energy, she edits the Microgrid News & Insight newsletter and website/blog. She holds a BA in journalism from the University of Massachusetts and an MFA in nonfiction writing from Antioch University. She has worked and freelanced for software startups, tech-industry government contractors, technology trade shows, magazines, and more. For several years, she served as marketing director and CFO of her husband's award-winning design/build firm. In addition to her work at HOMER Energy, Osie's focus is on family life with her husband and four children. She and her family moved to Boulder in 2015 and are enjoying all their new hometown has to offer. Osie also serves on the board of directors of Boulder-Nablus Sister City Project and is active in human rights and social justice issues. [top]

Henry Hunsinger

Henry Hunsinger, Digital Marketing Assistant

Recently graduated from the University of Colorado Boulder in digital marketing and advertising, Henry Hunsinger provides critical marketing and sales efforts to streamline complex business processes. In addition, he is Homer Energy’s in-house Salesforce administrator, working with and organizing large databases of information. Henry has also worked in social media marketing and is excited about creating valuable marketing experiences through every medium. Growing up in the mountains of Breckenridge, Colorado, Henry developed a deep passion for the outdoors and has been skiing since he could walk. On any given blue-sky weekend, you’ll find him taking turns through fresh powder, splashing around Boulder Creek, catching some rays on Pearl Street or hiking through the beautiful Flatirons in Boulder. [top]

Steffi Klawaiter

Steffi Klawiter, Component Library Manager

After completing her Bachelor’s thesis on the topic of galaxy movement at the University of Wisconsin – Madison, Steffi decided to re-direct her studies toward the nearer natural world. Utilizing her German language skills, she relocated to Freiburg, Germany to study Renewable Energy Management and to learn from Germany’s largely successful transition to renewables (‘Energiewende’). Steffi’s Master’s thesis on the feasibility of solar manufacturing in Saudi Arabia, in combination with her internship with a solar thermal system in Mongolia, have further inspired her interests in distributed energy, microgrids, and solar on the international level. [top]