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Board of Trustees

Scott Fouse

Scott D. Fouse, Chair

Fouse is the owner of Fouse Consulting Services, LLC, (based in Scottsdale, AZ) which helps companies harness advanced technology to enable future products and processes. Previously he was VP of the Advanced Technology Center at Lockheed Martin Space. In this role, he was responsible for leading approximately 500 scientists and engineers performing research and development in space science and a variety of space systems-related technologies and capabilities. Prior to ATC Scott served as Director of the Lockheed Martin Advanced Technology Laboratories (ATL) and earlier served as Chief Technology Officer of ATL. Before joining Lockheed Martin, Scott was President and CEO of ISX Corporation, a 50-person company that specialized in creating and transitioning advanced IT systems to operational use. Scott was a leader in the DARPA "Command Post of the Future" project, which created a significant advance in C2 Systems and was the primary C2 system for Iraq at the Corp. Division, Brigade and Battalion echelons. From 2003 - 2007 Scott was a member of the Air Force Scientific Advisory Board. In that position he supported a number of studies, directorate reviews, and chaired a study on Experimentation to support Disruptive Innovation. Scott has a BS in Physics from the University of Central Florida and a MS in Electrical Engineering from the University of Southern California.

Madelyn Creedon

Madelyn R. Creedon, J.D., Vice-Chair

Creedon retired from the U.S. Government in 2017 where she was Principal Deputy Administrator of the National Nuclear Security Administration (NNSA) within the Department of Energy. She also served in the Pentagon as Assistant Secretary of Defense for Global Strategic Affairs (2011 - 2014), overseeing policy development in the areas of missile defense, nuclear security, cybersecurity, and space. She served as counsel for the U.S. Senate Committee on Armed Services for many years with focus areas that included the Subcommittee on Strategic Forces, Threat Reduction, and Nuclear Nonproliferation. Concurrently she served as Deputy Administrator for Defense Programs at the NNSA, Associate Deputy Secretary of Energy, and General Counsel for the Defense Base Closure and Realignment Commission. Madelyn began her career as a trial attorney at the Department of Energy. She is the founder of Green Marble Group, LLC, a consulting company, and currently serves on a number of advisory boards related to national security. She has completed a fellowship at the U.S. Study Center at the University of Sydney and is presently a non-resident senior fellow at The Brookings Institute. She holds a J.D. from St. Louis University School of Law, and a B.A. from the University of Evansville.

Dr. William K. Hartmann

William K. Hartmann, Ph.D.

Hartmann is a founder and Senior Scientist of the Planetary Science Institute. He and Don Davis (see below) are known for developing, at PSI, the current theory of the origin of the Moon by a large planetesimal impact into the forming Earth. Hartmann's current work involves development of the "PSI isochron system" of counting impact craters to infer ages of various planetary surface units. Hartmann holds a Ph.D. in Astronomy and M.S. in Geology from the University of Arizona. He was the first winner of the Carl Sagan Award from the American Astronomical Society, a winner of the G.K. Gilbert award from the Geological Society of America, and a co-winner of the Runcorn-Florensky medal from the European Geophysical Union. In addition to his planetary work, he is known for his astronomical paintings and popular writing, including textbooks, popular science, and two published novels.

William Craig

William Craig, Ph.D.

Craig is an astrophysicist with a long history of conceiving, designing and implementing scientific instruments on both ground and space borne platforms. He holds a PhD in astrophysics from UC Berkeley and has experience with optical systems from the visible through the X-ray as well as gamma-ray detector systems. He has provided technical guidance on the implementation of spaceflight systems for NASA as well as other federal agencies throughout a career in academia and in various assignments with the US government. Throughout his career he has combined his scientific and technical skills to lead and manage a number of large projects and programs. He has been heavily involved in basic research and technology development throughout his career and managed the laboratory directed R&D program at Lawrence Livermore National Laboratory

Craig was the payload manager for the NuSTAR Small Explorer mission where he was responsible for managing a large multi-institutional effort to develop technology for and then deliver the successful NuSTAR instrument in 2012. He most recently managed the ICON Explorer mission for NASA, launched in 2019, delivering an observatory with 6 separate instruments.

Craig is currently chairing NASA Standing Review Boards for the XRISM, PACE and PUNCH missions and two US instruments on JAXA's MMX mission. Dr. Craig also serves on the National Academies Intelligence Science and Technology Experts Group, providing technical assessments to the US Government.

Mark Sykes

Mark V. Sykes, Ph.D., J.D.

Sykes is the C.E.O. and Director of the Planetary Science Institute. He studies asteroids, comets and interplanetary dust, using both ground-based and space-based telescopes, primarily in the thermal infrared. He is the discoverer of cometary dust trails and many extended structures arising from asteroid collisions within the zodiacal cloud.

Mark is the former Chair of the Division for Planetary Sciences (DPS) of the American Astronomical Society and was made a Fellow of the American Association for the Advancement of Science for his science advocacy. He has been honored by the designation of Minor Planet 4438 Sykes and has also been honored with the 2016 Masursky Award by the Division for Planetary Sciences of the American Astronomical Society for outstanding service to planetary science and exploration. 

Mark received his Ph.D. in Planetary Sciences in 1986 and J.D. in 1998 from the University of Arizona (and is admitted to the Arizona Bar). He is also a professional musician and has performed more than 30 seasons with the Arizona Opera Company's chorus. He is a member of the American Guild of Musical Artists.

Trustee Emeritus

Don Davis

Donald R. Davis, Ph.D.

Davis is a Founder and Senior Scientist of the Planetary Science Institute. He served on the PSI Board of Trustees for 15 years and now enjoys status as a Trustee Emeritus. In addition to his leadership of the Institute as co-founder and Director for more than 30 years, he has made many contributions to planetary science including advancing our knowledge of asteroids and of the origin of the Moon.

Past Board Members


Name Joined (Office)
2020 Tim Hunter 2002 (Vice-Chair 2005-2007, Chair 2008-2019)
2019 Erin Neal 2018
2019 Pamela A. Melroy 2017 (Vice-Chair 2018-2019)
2018 Michael Belton 2015 In Memorium
2018 Candace Kohl 2002 (Vice-Chair 2007-2017)
2017 Joe Alexander 2014
2017 Katy Schmoll 2015
2016 Brent Archinal 2002
2016 Benjamin W. Smith, J.D. 2002 (Secretary 2013-2016)
2015 Pat Simmons 2011
2012 Michael G. Gibbs 2009 (Secretary 2010-2013)
2010 Donald R. Davis * 1996  
2010 John L. Mason 1995 (Secretary 1998-2009) In Memorium 
2010 David H. Levy * 1999 (Vice-Chair 2000-2004, Chair 2005-2007)
2007 Carolyn S. Shoemaker * 2000  
2005 Byron D. Groves 1997 (Chair 1999-2004)
2004 Robert J. Parks 1998 (Treasurer 2000-2004)
2004 Dennis L. Matson * 1995  
2004 Humberto Campins * 2003  
2003 Alex Berman 2000  
2002 Wesley T. Huntress * 2000  
1999 George S. Holditch 1995 (Treasurer 1995-1999)
1998 Michael Berns 1995 (Vice-Chair 1995-1998)
1998 Walter Hansch 1995  
1998 Kip Kinnings 1995 (Secretary 1997, Chair 1998)
1997 Douglas B. Nash * 1995 (Chair 1995-1997)
1997 Eugene M. Shoemaker * 1997  
1996 Michael Udkovich 1995 (Secretary 1995-1996)
* Denotes that this individual has been honored with an asteroid being named after them.

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