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Mary Louise Cleave is an Americanmarker engineer and a former NASAmarker astronaut. She also served from 2004 to 2007 as NASAmarker Associate Administrator for the Science Mission Directorate.


Born February 5, 1947, in Southampton, New Yorkmarker. Her father, Dr. Howard E. Cleave, resides in Williamstown, Massachusettsmarker. Her mother is deceased. She grew up in Great Neck, New Yorkmarker.



Academic career

Cleave held graduate research, research phycologist, and research engineer assignments in the Ecology Center and the Utah Water Research Laboratory at Utah State University from September 1971 to June 1980. Her work included research on the productivity of the algal component of cold desert soil crusts in the Great Basin Desert south of Snowville, Utahmarker; algal removal with intermittent sand filtration and prediction of minimum river flow necessary to maintain certain game fish; the effects of increased salinity and oil shale leachates on freshwater phytoplankton productivity; development of the Surface Impoundment Assessment document and computer program (FORTRAN) for current and future processing of data from surface impoundments in Utahmarker; and design and implementation of an algal bioassay center and a workshop for bioassay techniques for the Intermountain West.

NASA career

Cleave was selected as an astronaut in May 1980. Her technical assignments have included: flight software verification in the Shuttle Avionics Integration Laboratory (SAIL); CAPCOM on five Space Shuttle flights; Malfunctions Procedures Book; Crew Equipment Design. A veteran of two space flights, Cleave logged a total of 10 days, 22 hours, 02 minutes, 24 seconds in space, orbited the Earth 172 times and traveled 3.94 million miles. She was a mission specialist on STS-61-B (November 26 to December 3, 1985) and STS-30 (May 4-8, 1989).

Cleave left JSCmarker in May 1991 to join NASAmarker's Goddard Space Flight Centermarker in Greenbelt, Marylandmarker. She worked in the Laboratory for Hydrospheric Processes as the Project Manager for SeaWiFS (Sea-viewing, Wide-Field-of-view-Sensor), an ocean color sensor which is monitoring vegetation globally. Cleave served as Associate Administrator, Science Mission Directorate, NASA Headquarters, Washington, D.C.marker. She stepped down from that position in April, 2007 and was succeeded by Dr. Alan Stern.

Spaceflight experience

STS-61-B Atlantis (Nov. 26 to Dec. 3, 1985) launched at night from the Kennedy Space Centermarker, Floridamarker, and returned to land on Runway 22 at Edwards Air Force Basemarker, Californiamarker. During the mission, the crew deployed the MORELOS-B, AUSSAT II, and SATCOM K-2 communications satellites, conducted 2 six-hour spacewalks to demonstrate space station construction techniques with the EASE/ACCESS experiments, operated the Continuous Flow Electrophoresis (CFES) experiment for McDonnell Douglas and a Getaway Special (GAS) container for Telesat, Canada, conducted several Mexican Payload Specialist Experiments for the Mexican Government, and tested the Orbiter Experiments Digital Autopilot (OEX DAP). This was the heaviest payload weight carried to orbit by the Space Shuttle to date. Mission duration was 165 hours, 4 minutes, 49 seconds.

STS-30 Atlantis (May 4-8, 1989) was a four day mission during which the crew successfully deployed the Magellan Venus-exploration spacecraft, the first U.S. planetary science mission launched since 1978, and the first planetary probe to be deployed from the Shuttle. Magellan arrived at Venus in August 1990 and radar-mapped over 95% of the surface of Venus. Magellan has been one of NASA's most successful scientific missions providing valuable information about the Venusian atmosphere and magnetic field. In addition, the crew also worked on secondary payloads involving Indium crystal growth, electrical storm, and earth observation studies. Mission duration was 96 hours, 57 minutes, 35 seconds.


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