*************************************************************************** IERS Message No. 13 August 21, 2001 *************************************************************************** Invitation to a Reception Honoring John Bosworth --- Tom Clark during the venue of the IAG Scientific Assembly 2001 Hosted by the IAG Services: IERS, ILRS, IVS, and IGS Dear colleagues, In June of this year two people retired from long-held leadership positions in the development and evolution of space geodesy - John Bosworth and Tom Clark of NASA's Goddard Space Flight Center. John was a central figure in the Crustal Dynamics Project and follow-on activities for the last 20 years. With this retirement he will also be vacating his position as the first Director of the Central Bureau of the International Laser Ranging Service and Chair of the CSTG Sites sub-commission. Tom Clark is widely recognized as the 'Guru' of VLBI, and has an impressive 32 year involvement in its development. Both Tom and John are have had influence on GPS: John's pursuing the multi-technique collocation site ties, and Tom's operations of the GPS equipment at GSFC, his totally accurate clock (TAC), and phase center measurements of the GPS antennae. An interesting review of their professional careers is planned with your help. We invite you to attend and if you have a particular memory that you will share, it will contribute to a memorable evening! Please join us: Honors Reception John Bosworth --- Tom Clark Monday, September 3, 20001 6:00 - 9:00 PM Taverna Hotel - Budapest Rooom 1052 Budapest, Vaci utca 20. Phone: +361 485 3100 Fax: +361 485 3111 * Excellent Hors D'Oeuvres will be served, cash bar. * Bring your memories and enjoy an evening with friends. ** Please RSVP ** reply to this message or send a message to ruth.neilan@jpl.nasa.gov with the word 'Reception' in the Subject. Additional Detail John Michael Bosworth, Associate Chief of the Laboratory for Terrestrial Physics and Head of the Space Geodesy and Sensor Calibration Office (Code 920.1), retired from GSFC on June 1 following almost 40 years of federal service, all but two years with NASA. Mr. Bosworth was honored by many individuals or organizations at his retirement dinner on June 12. John had a long and successful career as a Project Manager at Goddard but is perhaps best remembered for his past two decades of effort on behalf of space geodesy - first as Deputy Manager under Dr. Bob Coates, and then later as Manager, of NASA's Crustal Dynamics Project (CDP). The CDP scored many scientific firsts in making precise contemporary measurements of tectonic plate motion, regional crustal deformation, Earth orientation parameters (spin axis orientation and spin rate or length of day), Earth gravity field, etc. Following the termination of CDP in 1993 and the movement of space geodetic network responsibilities to GSFC's Laboratory for Terrestrial Physics, John retained primary responsibility for the management of NASA's SLR and VLBI networks and served as head of the CSTG Sites Subcommission and as the first Director of the International Laser Ranging Service (ILRS) Central Bureau, which is located at GSFC. Dr. Thomas Arvid Clark retired from GSFC on June 1, 2001. Tom received his B.S. in Engineering Physics and his Ph.D. in Astro-Geophysics from the University of Colorado in 1961 and 1967 respectively. From 1966 to 1968, he served as Chief of the Astronomy Branch at NASA Marshall Space Flight Center and as Project Scientist on the Spacelab Coronagraph. Since arriving at GSFC in 1968, Dr. Clark has received numerous NASA awards for his pioneering work on Radio Astronomy Explorer 1 and 2 and several generations of Very Long Baseline Interferometry (VLBI) systems. Since the beginning of the NASA Crustal Dynamics Project in 1979, a global network of approximately 30 VLBI stations have been used to define the Celestial reference Frame and to measure global plate tectonics, Earth orientation parameters, and Universal Time. In recent years, he developed the Totally Accurate Clock (TAC), an inexpensive GPS timing receiver that has found widespread use in a number of global networks. Tom was named a Fellow of the American Geophysical Union (AGU) in 1991 and a Fellow of the International Association of Geodesy (IAG) in 1999. Tom was also a pioneer in amateur and digital radio; he designed and flew several low cost satellites for relaying amateur radio messages around the globe and is a past president of AMSAT. In May 2001, he was one of only 50 initial inductees into the CQ Amateur Radio Hall of Fame, a list which included such engineering luminaries and inventors as Guglielmo Marconi (radio), Samuel Morse (telegraph), Nikola Tesla (HF generators and radio), and John Bardeen and William Schockley (transistor). Dr. Clark has applied for GSFC Emeritus status. Ruth Neilan & Carey Noll *************************************************************************** IERS Messages are edited and ditributed by the IERS Central Bureau. To subscribe or unsubscribe, please write to <central_bureau@iers.org>. Archives: http://www.iers.org/iers/publications/messages/ ***************************************************************************