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STScI Director Steven Beckwith Inducted as 2004 American Academy Fellow
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By NASA
Former Johnson Director Jefferson Howell July 3, 2025
Jefferson Davis Howell, Jr., former director of NASA’s Johnson Space Center in Houston, died July 2, in Bee Cave, Texas. He was 85 years old.
Howell was a champion of the construction of the International Space Station, working on a deadline to complete the orbiting lab by 2004. He oversaw four space shuttle crews delivering equipment and hardware to reach that goal. He also served as director during a pivotal moment for the agency: the loss of STS-107 and the crew of space shuttle Columbia. He made it his personal responsibility to meet with the families, look after them, and attend memorial services, all while keeping the families informed of the accident investigation as it unfolded.
“Gen. Howell led NASA Johnson through one of the most difficult chapters in our history, following the loss of Columbia and her crew,” said acting associate administrator Vanessa Wyche. “He brought strength and steady direction, guiding the workforce with clarity and compassion. He cared deeply for the people behind the mission and shared his leadership skills generously with the team. We extend our heartfelt condolences to his family and all who knew and loved him.”
At the time of his selection as director, he was serving as senior vice president with Science Applications International Corporation (SAIC) as the program manager for the safety, reliability, and quality assurance contract at Johnson. Following the accident, he made it his mission to improve the relationship between the civil servant and contractor workforce. He left his position and the agency, in October 2005, shortly after the Return-to-Flight mission of STS-114.
“General Howell stepped into leadership at Johnson during a pivotal time, as the International Space Station was just beginning to take shape. He led and supported NASA’s successes not only in space but here on the ground — helping to strengthen the center’s culture and offering guidance through both triumph and tragedy,” said Steve Koerner, Johnson Space Center’s acting director. “On behalf of NASA’s Johnson Space Center, we offer our deepest sympathies to his family, friends, and all those who had the privilege of working alongside him. The impact of his legacy will continue to shape Johnson for decades to come.”
The Victoria, Texas, native was a retired lieutenant general in the U.S. Marine Corps with a decorated military career prior to his service at NASA. He flew more than 300 combat missions in Vietnam and Thailand.
Howell is survived by his wife Janel and two children. A tree dedication will be held at NASA Johnson’s memorial grove in the coming year.
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Chelsey Ballarte
Johnson Space Center, Houston
281-483-5111
chelsey.n.ballarte@nasa.gov
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By NASA
3 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Earth scientist Compton J. Tucker has been elected to the National Academy of Sciences for his work creating innovative tools to track the planet’s changing vegetation from space. It’s research that has spanned nearly 50 years at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, where he is a visiting scientist after retiring in March.
Tucker’s research began with identifying wavelengths of light that are absorbed or reflected as plants undergo photosynthesis, and has evolved into calculating the health and productivity of vegetation over time with satellites.
“I’m honored and surprised,” Tucker said of his election. “There were opportunities at the Goddard Space Flight Center that have enabled this work that couldn’t be found elsewhere. There were people who built satellites, who understood satellite data, and had the computer code to process it. All the work I’ve done has been part of a team, with other people contributing in different ways. Working at NASA is a team effort of science and discovery that’s fun and intellectually rewarding.”
Earth scientist Compton Tucker, who has studied remote sensing of vegetation at NASA Goddard for 50 years, has been elected to the National Academy of Sciences.Courtesy Compton Tucker Tucker earned his master’s and doctoral degrees from Colorado State University, where he worked on a National Science Foundation-funded project analyzing spectrometer data of grassland ecosystems. In 1975, he came to NASA Goddard as a postdoctoral fellow and used what he learned in his graduate work to modify the imager on National Oceanic and Atmospheric Administration (NOAA) meteorological satellites and modify Landsat’s thematic mapper instrument.
He became a civil servant at the agency in 1977, and continued work with radiometers to study vegetation – first with handheld devices, then with NOAA’s Advanced Very High Resolution Radiometer satellite instruments. He has also used data from Landsat satellites, Moderate Resolution Imaging Spectroradiometer instruments, and commercial satellites. His scientific papers have been cited 100,000 times, and one of his recent studies mapped 10 billion individual trees across Africa’s drylands to inventory carbon storage at the tree level.
“The impact of Compton Tucker’s work over the last half-century at Goddard is incredible,” said Dalia Kirschbaum, director of the Earth Sciences Division at NASA Goddard. “Among his many achievements, he essentially developed the technique of using satellites to study photosynthesis from plants, which people have used to monitor droughts, forecast crop shortages, defeat the desert locust, and even predict disease outbreaks. This is a well-deserved honor.”
Goddard scientist Compton Tucker’s work using remote sensing instruments to study vegetation involved field work in Iceland in 1976, left, graduate student research at Colorado State University in the early 1970s, top right, and analyzing satellite data stored on tape reels at Goddard.Courtesy Compton Tucker The National Academy of Sciences was proposed by Abraham Lincoln and established by Congress in 1863, charged with advising the United States on science and technology. Each year, up to 120 new members are elected “in recognition of their distinguished and continuing achievements in original research,” according to the organization.
In addition his role as a visiting scientist at Goddard, Tucker is also an adjunct professor at the University of Maryland and a consulting scholar at the University of Pennsylvania’s University Museum. He was awarded the National Air and Space Collins Trophy for Current Achievement in 1993 and the Vega Medal by the Swedish Society of Anthropology and Geography in 2014. He is a fellow of the American Association for the Advancement of Science and the American Geophysical Union, and won the Senior Executive Service Presidential Rank Award for Meritorious Service in 2017, among other honors.
By Kate Ramsayer
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Last Updated Jun 05, 2025 EditorErica McNameeContactKate D. Ramsayerkate.d.ramsayer@nasa.govLocationNASA Goddard Space Flight Center Related Terms
Goddard Space Flight Center Earth General Landsat Moderate Resolution Imaging Spectroradiometer (MODIS) View the full article
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By NASA
Dave Gallagher will become the director of NASA’s Jet Propulsion Laboratory in Southern California on Monday, June 2. Credit: NASA/JPL-Caltech The following is a statement from acting NASA Administrator Janet Petro on the appointment of David Gallagher as director of the agency’s Jet Propulsion Laboratory (JPL) in Southern California. NASA JPL announced Wednesday Laurie Leshin would step down effective Sunday, June 1.
“Laurie Leshin’s leadership at JPL has been nothing short of extraordinary. She brought a sharp scientific mind, a strong sense purpose, and a clear vision that helped propel the lab forward during a pivotal time. From groundbreaking missions to remarkable technological milestones, Laurie advanced JPL’s legacy of exploration and innovation. We are grateful for her service and wish her the very best as she continues to inspire in the next phase of her career.
“I’m equally confident in Dave Gallagher’s ability to lead JPL’s next chapter. He brings decades of experience, a steady hand, and a deep understanding of what makes JPL unique. With Dave at the helm, JPL remains well-positioned to continue delivering for NASA and the nation – pushing the boundaries of science and discovery for the benefit of all.”
For more information about NASA, visit:
https://www.nasa.gov
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Bethany Stevens / Amber Jacobson
Headquarters, Washington
202-358-1600
bethany.c.stevens@nasa.gov / amber.c.jacobson@nasa.gov
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Last Updated May 07, 2025 EditorJennifer M. DoorenLocationNASA Headquarters Related Terms
Jet Propulsion Laboratory View the full article
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By NASA
Dave Gallagher will become the director of NASA’s Jet Propulsion Laboratory in Southern California on Sunday, June 1. NASA/JPL-Caltech Laurie Leshin has decided to step down as director of NASA’s Jet Propulsion Laboratory on Sunday, June 1. David Gallagher, who has been serving as the Lab’s associate director for Strategic Integration, has been selected by Caltech to lead the federally funded research and development center. Caltech manages JPL for NASA.
A distinguished geochemist, Leshin was named by Caltech to lead the lab in early 2022. Her career has spanned academia and senior positions at NASA. Several NASA missions managed by JPL have launched under her leadership, including EMIT, SWOT, Psyche, PREFIRE, Europa Clipper, and SPHEREx, with the NASA-Indian Earth satellite NISAR set for a June launch. In addition, JPL has advanced the development of NASA’s asteroid-hunting NEO Surveyor mission as well as the trio of CADRE lunar rovers, and it delivered the Coronagraph Instrument, a technology demonstration with NASA’s forthcoming Roman Space Telescope.
“I am proud of the many things JPL has accomplished over the past three years,” said Leshin. “In addition to the long list of missions that have launched or moved toward launch during that time, we saved Voyager more than once and flew into history on Mars with Ingenuity. We have made more amazing scientific discoveries than I can name, including finding potential ancient Martian biomarkers with Perseverance. And we’ve driven the forefront of technology on Earth and in space. I know those achievements will continue under Dave’s capable leadership.”
Leshin, who has also served as Caltech vice president, is stepping down for personal reasons and will remain a Bren Professor of Geochemistry and Planetary Science at Caltech.
“While we respect Laurie’s decision to step away from her leadership position at JPL, we will miss her drive, compassion, and dedication,” Caltech President Thomas Rosenbaum said. “At the same time, we are grateful to Dave Gallagher for his devotion to JPL and his continuing leadership and partnership going forward. Dave’s experience working across multiple government and private sector entities will help secure ongoing support for America’s agenda in space, with JPL continuing to play an essential role.”
Gallagher will draw on his deep experience at JPL to lead the lab into the future. He arrived at JPL 36 years ago, in 1989, and went on to hold numerous leadership positions. Along with having served as the director and deputy director for Astronomy, Physics, and Space Technology, he was manager of JPL’s Advanced Optical Systems Program Office. An electrical engineer, Gallagher also managed the Spitzer Space Telescope and, among other roles, led the team that built and tested the Wide Field/Planetary Camera 2 (WF/PC-2) — a critical instrument that corrected the spherical aberration on NASA’s Hubble Space Telescope.
“Laurie has made a significant impact on energizing and focusing the lab, guiding it back on track after the Covid-19 pandemic. I wish her great success in this next chapter of her career, and I look forward to a very smooth transition at the lab,” said Gallagher. “We have exciting opportunities ahead helping to advance our nation’s space agenda and a fantastic team to help realize them.”
Founded by Caltech faculty and students in 1936, JPL has been managed by Caltech on behalf of NASA since 1958.
News Media Contacts
Matthew Segal / Veronica McGregor
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-8307 / 818-354-9452
matthew.j.segal@jpl.nasa.gov / veronica.c.mcgregor@jpl.nasa.gov
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By European Space Agency
ESA Director General Josef Aschbacher emphasises the importance of cooperation in space activities
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