david freeman

S. David Freeman

In Memoriam

Harry Lehmann

Dr. Harry Lehmann

Director PTX Lab Lausitz

Alexa Lutzenberger

Dr. Alexa Lutzenberger

Managing Partner ResScore GmbH

Richard L. Ottinger

Richard L. Ottinger

Dean Emeritus – Pace University School of Law

Dave Renne

Dr. David Renné

Immediate Past President International Solar Energy Society ISES

Heather Rosmarin

Executive Director of the InterAmerican Clean Energy Institute

Prof. Eicke Weber

Professor Eicke R. Weber

Co-Chair European Solar Manufacturing Council ESMC

david freeman

Simon David Freeman

(January 14, 1926 – May 12, 2020) was an American engineer, attorney, and author, born in Chattanooga, Tennessee, who has had many key roles in energy policy. He most recently served as Interim General Manager of the Los Angeles Department of Water and Power (LADWP), the largest municipal utility in the country, managing over 8,500 employees and an annual budget of more than four billion dollars.

Prior to his appointment, Mr. Freeman served the City of Los Angeles as Deputy Mayor of Energy and Environment, the City’s chief environmental official. He was previously President of the Los Angeles Harbor Commission, where he led the boards of the ports of Los Angeles and Long Beach to adopt the San Pedro Bay Ports Clean Air Action plan, a comprehensive strategy to reduce port air emissions by nearly 50 percent over a period of five years.

Before this, Freeman was termed an “eco-pioneer” for his environmental friendly leadership of the Sacramento Municipal Utility District (SMUD).

Freeman was the first person with energy-related responsibilities in the Federal government, appointed by President Lyndon Johnson in 1967. Thereafter, he began a 30-year run as board member and manager of many of America’s largest publicly-owned utilities.

President Jimmy Carter appointed him Chairman of the Tennessee Valley Authority in 1977, where he cut sulfur oxide emissions in half, stopped construction of eight large nuclear power plants and pioneered a massive energy conservation program.

Mr. Freeman then served as general manager of large public power agencies for the next two decades, including his first tenure with LADWP from 1997 to 2001.

Mr. Freeman held a B.S. in Civil Engineering from Georgia Tech, and an L.L.B. from the University of Tennessee. Mr. Freeman served as a Merchant Marine in World War II, transporting gasoline across the North Atlantic.

He authored “Energy: The New Era in 1974,” and “Winning Our Energy Independence: An Energy Insider Shows How” in 2007.  

Harry Lehmann

Dr. Harry Lehmann

Director of the “PTX Lab Lausitz” (Z-U-G gGmgH

The physicist and systems analyst (born 30.11.1954 in Peru) began his professional career in elementary particle physics and numerical physics.Initial studies on climate change then led to a switch to applied environmental research in 1985.

In his work, he particularly links the thematic complexes of resource and energy transition. The focus of his work is the holistic and cross-system search for solutions to the problems of sustainability.

As early as the 1990s, he wrote scenarios for 100 percent supply with renewable energies.

His doctorate at the University of Lüneburg, in 2003, was dedicated to the topic “Structure and dynamics of energy systems based on renewable energies”. Until recently, he has worked on coupled scenarios (see “RESCUE” study by the UBA).

In addition, he has co-founded or been involved in various companies and organisations (e.g EUROSOLAR).

Since 1985, he has taught at various universities (including Leuphana Lüneburg).

He is the editor of the “Factor X” book series and co-author of various publications.

From 2021
Director of the “PTX Lab Lausitz” (Z-U-G gGmgH)

From 2016
Member of the German-Japanese Energy Transition Council (GJETC) (

From 2011
World Resources Forum – Board (

From 2001
Executive Chairman of the World Council for Renewable Energies (WCRE) after the death of Hermann Scheer.

From 1998
Member of the Factor 10 – X Club, Chairman since 2004.

From 1997
Member of the selection committee of the project “50 Solar Housing Estates” today “100 Climate Protection Housing Estates”, of the State of NRW, Energy Agency NRW.

2008 – 2010
Member of the IBA Hamburg – Wilhelmsburg Advisory Board for Climate and Energy.

2005 – 2011
Member of the scientific advisory board of the “UFZ Umweltforschungszentrum Leipzig-Halle”.

2001 – 2015
Lectureships at Leuphana University Lüneburg, Department of Environmental Sciences: “Renewable energy technologies” and “Environmental Policy”,

2004 – 2020
Federal Environment Agency (Dessau/Roßlau) Head of Department I, “Environmental Planning and Sustainability Strategy”

2000 – 2004
ISUSI – Foundation and management of the “Institute for Sustainable Solutions and Innovations”, Aachen.

2000 – 2003
Greenpeace International (Amsterdam) – Director of the “Solutions and Innovations Unit”.

2000 – 2002
Member of the Enquete Commission of the German Bundestag: “Sustainable Energy Supply under the Conditions of Globalisation and Liberalisation”,

1999 – 2003
Member of the Enquete Commission of the Bavarian State Parliament: “With new energy into the new millennium”.

1998 – 2000
Member of the Supervisory Board of Naturstrom AG.

1996 – 2000
Member of the founding board of the “European Business Council for a Sustainable Energy Future – E5”.

1994 – 1998
Member of the “Round Table Renewable Energies” of the Price Supervision of the “Ministry of Economic Affairs and Technology” of the State of North Rhine- Westphalia.

1991 – 2000
“Wuppertal Institute for Climate, Environment and Energy” of the Wissenschaftszentrum NRW, Head of System Analysis and Simulation.

1988 – 2006
Co-founder of EUROSOLAR together with Hermann Scheer, first on the German Board, then German Chairman, from 2000 European Vice-President.

1985 – 1990
Founded the engineering office “UHL Data”. System analysis and system simulation in energy technology and environmental protection.

1985 – 1998
Lectureships at the University of Applied Sciences Aachen, Dept. Jülich, Department of Physical Engineering, “Applied Computer Science in Energy Technology”.

1981 – 1985
Member of the “UA1” collaboration at CERN in Geneva, Search and discovery of intermediate vector bosons at the proton-antiproton storage ring, Headed by Prof. Dr. Carlo Rubbia (Nobel Prize 1984).

Alexa Lutzenberger

Dr. Alexa Lutzenberger

teaches at the University of Leuphana at Lueneberg, one of Germany’s leading institutions on the study of sustainability, where she is a Member of the Institute of Environmental and Sustainable Chemistry.

She also serves as committee member of BKK, the German biogenous and regenerative fuels association. Among other endeavors, she is additionally helping Dr. Harry Lehmann, Director of the German Federal Environment Agency, lead the European team on the Renewables 100 Policy Institute’s proposed roadmap study for how to achieve 100% renewable energy in California.

Richard L. Ottinger

Richard L. Ottinger

Dean Emeritus of Pace Law School, has always been an ardent environmentalist and energy advocate. In his 16 years as a member of the United States House of Representatives, he authored a substantial body of energy and environmental laws. As Chair of the House Energy Conservation and Power Subcommittee of the Energy and Commerce Committee, he was a pioneer in educating Members of Congress and the public in the advantages of energy efficiency and renewable energy, a founder of the Environmental & Energy Study Group, the largest non-partisan bicameral Congressional organization, that continues as the independent Environmental and Energy Study Institute in Washington, D.C,, serving on its Board of Directors.

He also serves on the Board of the National Council for Science and the Environment and is Chair of the Energy Law and Climate Change Specialty Group of the International Union for the Conservation of Nature (IUCN).

In 1984, having retired from Congress, Mr. Ottinger came to Pace Law School where his impact on shaping environmental policy and inspiring new generations of environmental lawyers continues.

He served as Dean of the Law School from 1994 to 1999. Presently Dean Emeritus Ottinger serves as Co-director of the Pace Center for Environmental Legal Studies.

Most notably he is also Founder and Faculty Supervisor of the Pace Energy and Climate Center, a principal national and international advocate for clean energy and climate change remediation.

He is author or co-author of five treatises and some 100 law review articles, frequently cited by the Courts. Richard Ottinger earned his BA from Cornell University and a J.D. from the Harvard University School of Law.

He served as a Captain in the U.S. Air Force in the Korean War was a founding staff member of the U.S. Peace Corps.

Dave Renne

Dr. David Renné

is currently in his third term as the President of the International Solar Energy Society [ISES].

He retired from the National Renewable Energy Laboratory in the U.S., 2012, where, since 1991, he developed and managed programs on renewable energy resource assessment and analysis, and the integration of resource data into GIS. He now holds an Emeritus position at NREL.

He continues to serve as the Operating Agent of an International Energy Agency Solar Heating and Cooling Programme Task 46 titled “Solar Resource Assessment and Forecasting”.

He is also an Associate Editor of the Solar Energy Journal.

He is a Senior Consultant with Clean Power Research, a small company that develops solar resource assessment products for industry, governments and utilities.

Dr. Renne received his Masters and PhD degrees in the field of atmospheric sciences at Colorado State University.

Heather Rosmarin

Executive Director of the InterAmerican Clean Energy Institute

Heather Rosmarin is the Executive Director of the InterAmerican Clean Energy Institute, a nonprofit organization working to advance clean energy deployment in the Americas.

Before founding the Institute, Ms. Rosmarin practiced law at Cooley LLP’s Silicon Valley office, where she represented clean energy and technology companies and investors.

She is an elected Fellow of the American Bar Foundation and former Co-Chair of the American Bar Association’s Energy Markets and Finance Committee.

Ms. Rosmarin co-authored Distributed Generation Law: A Guide to Regulations, Policies, and Programs (American Bar Association, 2020), and her articles have been published in Energy Focus and the California International Law Journal. She is also a regular contributor to REN21’s Renewables Global Status Report.

Ms. Rosmarin has presented in multiple academic, industry, and policy fora, including the American Council on Renewable Energy (ACORE) Renewable Energy Latin American & Caribbean Conference, Energy Institute at U.C. Berkeley Haas School of Business, International Conference on Public Policy, Stanford Graduate School of Business, and TU Delft.

Ms. Rosmarin holds a J.D. from the University of California, Berkeley School of Law, where she was Supervising Editor of the California Law Review, an A.B. from Princeton University, and an executive certificate in Climate Change Economics and Governance from the London School of Economics and Political Science.

Prof. Eicke Weber

Professor Eicke R. Weber

He retired from the National Renewable Energy Laboratory in the U.S., 2012, where, since 1991, he developed and managed program

is the Director of the Fraunhofer Institute for Solar Energy Systems ISE and professor of physics/solar energy at the Department of Mathematics and Physics and the Department of Engineering respectively at the University of Freiburg, Germany. Fraunhofer ISE is the largest solar energy research institute in Europe and is renowned worldwide for its research in the field of renewable energy and energy efficiency.

As researcher in the field of material science, Prof. Weber analyzed lattice defects in silicon and III-V semiconductors. In recent years, he is especially interested in producing high-quality solar cells from upgraded metallurgical silicon, or umg-Si, without the use of chlorine-based chemicals.

In 1976, Prof. Weber received his doctorate in physics from the University of Cologne, Germany. After research positions in North America and Sweden, he received his habilitation from the University of Cologne in 1983. In the same year, he took a position as professor at the University of California, Berkeley, in the Department of Materials Science and Engineering. In 2004, he was named Chairman of the interdisciplinary Nanoscale Science and Engineering Graduate Group. During his time at UC Berkeley, he spent a sabbatical semester as visiting professor at the Tokohu University in Sendai as well as at the Kyoto University in Japan.

Prof. Weber was elected Founding President of the Berkeley Chapter of the Alexander von Humboldt Association of America (AvHAA) and acted from 2001-2003 as president. In 1994 he received the Alexander von Humboldt Prize and in 2006 the Award of Merit (Bundesverdienstkreuz am Bande) of the German President. He is a fellow of the American Physical Society and Founding President of both the German Scholars Organization (GSO) and the German Energy Storage Association (BVES), Berlin.

In July 2008, Weber was appointed Director of the SEMI International Board of Directors. The Electrochemical Society ECS, San Francisco honored Weber with the Electronics and Photonics Division Award in June 2009. In October 2009, he was elected Honorary Member of the Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St. Petersburg. Since April 2010, Prof. Weber is a member of acatech – the German Academy of Science and Engineering, Berlin.

He was appointed Managing Director of the Centre for Renewable Energy at the University of Freiburg in May 2013. In June 2013, Prof. Weber was honored with the SolarWorld Einstein Award. In January 2014, he received the Zayed Future Energy Prize, endowed with 1.5 million US dollars, from the Crown Prince of Abu Dhabi on behalf of Fraunhofer ISE.