Employment History:
March 31, 1996 to 2005.   Consultant to NASA through Lockheed on orbital debris models and to Prairie View A&M University on orbital debris course development.   Managing Editor for Kluwer Academic Publishers of Space Debris, an international journal.

NASA, Johnson Space Center, 1962 through March 31, 1996.
Over 30 years of experience in scientific research associated with orbital debris, meteoroids, and interplanetary dust, especially in relationship with developing mathematical models, deriving collision probabilities, using sampling techniques, and defining the space environment.

• 1990-1996.  NASA's Senior Scientist for Orbital Debris Research.  Coordinated NASA's orbital debris research program.  Participated in national and international reviews of other agency's orbital debris programs.  Participated in establishing an international agency to address orbital debris issues (Inter-Agency Space Debris Coordination Committee).

• 1980-1990.  Developed orbital debris models; recommended and developed experiments to test models; analyzed orbital debris data; conducted classes, workshops, and symposia on orbital debris; recommended cost effective techniques to control orbital debris.

• 1965-1980.  Modeled interplanetary meteoroid environment, flight control of Skylab experiments, atmospheric environment research.  Developed early orbital debris model and began establishing the need for an orbital debris program.

• 1962-1965.  Cooperative education student, University of Houston and NASA.

Significant Accomplishments:  First to predict the presence of uncataloged orbital debris in sufficient quantity to exceed the meteoroid hazard to spacecraft; identified major debris sources; developed new modeling approaches; organized and conducted first national and international workshops on orbital debris; first to obtain and analyze data to measure uncataloged debris; predicted consequence of anti-satellite tests and participated in US Air Force and Strategic Defense Command tests and measurements program; participated in studies on Orbital Debris by the USAF Scientific Advisory Board, the AIAA, Interagency Group (Space), House of Representative Subcommittee, Office of Technology Assessment, National Research Council and GAO; responsible for the orbital debris environment used for Space Station design.  In 1990, appointed Senior Scientist for Orbital Debris Research, Solar System Exploration Division.

Education:  B.S. with Honors in Physics, University of Houston, 1965.

Publications:  Approximately 100 technical articles or extended abstracts on meteoroids and orbital debris; contributing author or editor of 10 major reports.