A NASA Discovery mission to conduct the first orbital study
of the innermost planet
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MESSENGER Telecon Panel Biographies

Andrew B. Calloway, MESSENGER Mission Operations Manager
The Johns Hopkins University Applied Physics Laboratory

Andrew B. Calloway Andrew Calloway has more than 17 years experience in space mission operations and ground system development efforts. He began his career supporting multiple commercial and international geosynchronous communications satellite launches and operations. He then spent six years supporting the Tropical Rainfall Measuring Mission, a low-Earth-orbiting Earth resources satellite, at NASA Goddard Space Flight Center, where he spent the last four years as the technical operations lead. He has been a member of the MESSENGER operations team since he joined The Johns Hopkins University Applied Physics Laboratory (APL) in 2002.

Contact Information: 240.228.8221
E-mail: andy.calloway@jhuapl.edu

Carl S. Engelbrecht, MESSENGER Propulsion Subsystem Lead
The Johns Hopkins University Applied Physics Laboratory

Carl S. Engelbrecht Carl Engelbrecht has more than 25 years of experience at the Jet Propulsion Laboratory, Aerojet (Redmond), Daimler-Benz Aerospace AG (Germany), and APL in the analysis, design, procurement, and integration and test of a wide range of types of electric, and chemical space propulsion components and systems. His experience includes systems and subsystem engineering, line and technical management, and leadership of internal and subcontractor teams. His direct work experience spans a wide range from launch vehicles to deep space probes. He has served as spacecraft system engineer on the Liquid Plume Experiment (LPX) program, and supported and led propulsion system development on Galileo (Jupiter), Magellan (Venus), Cassini (Saturn), MESSENGER (Mercury), New Horizons (Pluto), STEREO, SMART-1, Coriolis, and Deep Space 1, and launch vehicle attitude control systems for the Ariane V and Athena launch vehicles.

Contact Information: 240.228.0397
E-mail: carl.engelbrecht@jhuapl.edu

Sean Solomon, MESSENGER Principal Investigator
Carnegie Institution of Washington, Washington

Sean Solomon As Principal Investigator for the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission, Sean Solomon heads a multi-institutional consortium of scientists and engineers who operate the small, efficient spacecraft, which launched in 2004 and will reach its target orbit in 2011.

Prior to MESSENGER, the only craft sent to Mercury was Mariner 10 in the 1970s, and it imaged less than half of the planet. With a suite of seven miniaturized instruments, MESSENGER will address questions that are key to understanding terrestrial planet evolution. Solomon's particular interests are to learn more about Mercury's bulk composition and what that tells us about planet formation in general; to investigate Mercury's volcanic, tectonic, and internal evolution; and to understand how the planet's magnetic field originated and determine the characteristics of Mercury's liquid outer core. Mariner 10 discovered that Mercury has a weak magnetic field, which may arise from an Earth-like electromagnetic dynamo in the planet's outer core. MESSENGER will investigate this question as well as the nature of the planet's thin atmosphere and the composition of the permanently shadowed polar deposits.

Solomon has also been a team member on a variety of other projects, including the Magellan mission to Venus, the Mars Orbiter Laser Altimeter (MOLA) investigation on the Mars Global Surveyor spacecraft, and the Plume-Lithosphere Undersea Melt Experiment (PLUME) on Earth. The Magellan mission produced global radar image and altimetric maps of the surface of Venus. Data from MOLA have been used to construct precise topographical maps to understand Martian geology, geophysics, and atmospheric circulation. PLUME is a combined land and ocean-bottom seismic experiment to image the mantle beneath the Hawaiian hotspot. Solomon led the land section of this project.

Solomon balances his position as director of Carnegie Institution of Washington's Department of Terrestrial Magnetism with research in planetary geology and geophysics, seismology, marine geophysics, and geodynamics. Prior to accepting his current position, he was a professor of geophysics at the Massachusetts Institute of Technology for more than 20 years. He is a member of the National Academy of Sciences, a fellow of the American Academy of Arts and Sciences, and a former president of the American Geophysical Union.

Contact Information: 202.478.8850
E-mail: scs@dtm.ciw.edu

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