...Mark is a member of Tau Beta Pi, Sigma Xi, Phi Beta Kappa, and the National Academy of Engineering. He is a Fellow of the American Physical Society and the American Institute of Aeronautics and Astronautics. He also belongs to a numljer of other professional associations...

...Atmospheric Sciences and a meml>er of the editorial board of the Journal of Planetary and Space Sciences. He is a fellow of the American Physical Society and the American Astronautical Society, and a member of the Royal Astronomical Society, the American Astronomical Society,...

...Atmospheric Sciences and a member of the editorial board of the Journal of Planetary and Space Sciences. He is a fellow of the American Physical Society and the American Astronautical Society, and a member of the Royal Astronomical Society, the American Astronomical Society,...

...member of the Commission on High Energy Physics of the International Union of Pure and Applied Physics. He Is a fellow of the American Physical Society and the American Academy of Arts and Sciences, and a member of the National Academy of Sciences and the American Philosophical...

...He served as Scientific Secretary to the Director General of the Second Geneva Conference in 1958. He is a Fellow of the American Physical Society and the American Nuclear Society. He served as Chairman of the Mathematics and Computations Division of the American Nuclear Society...

...Mark is a member of Tau Beta Pi, Sigma Xi, Phi Beta Kappa, and the National Academy of Engineering. He is a Fellow of the American Physical Society and the American Institute of Aeronautics and Astronautics. He also belongs to a number of other professional associations...

...acceptance for their use. He is now Program Manager at LASL for Nuclear Safeguards affairs. Keepin is a Fellow of the American Physical Society and the American Nuclear Society and is National Chairman of the Institute of Nuclear Materials Manage ment. He is widely published in the...

...Mark is a member of Tau Beta Pi, Sigma Xi, Phi Beta Kappa and the National Academy of Engineering. He is a fellow of the American Physical Society and the American Institute of Aeronautics and Astronautics. He also belongs to a number of other professional associations...

...Mark is a member of Tau Beta Pi, Sigma Xi, Phi Beta Kappa and the National Academy of Engineering. He is a fellow of the American Physical Society and the American Institute of Aeronautics and Astronautics. He also belongs to a number of other professional associations...

...Mark is a member of Tau Beta Pi, Sigma Xi, Phi Beta Kappa and the National Academy of Engineering. He is a fellow of the American Physical Society and the American Institute of Aeronautics and Astronautics. He also belongs to a number of other professional associations...