James E. Hansen ( born March 29 , 1941 in Denison , Iowa ) heads the NASA Goddard Institute for Space Studies in New York City , a part of the Goddard Space Flight Center in Greenbelt , Maryland , Earth Sciences Division . James E. Hansen ( born March 29 , 1941 ) heads the NASA Goddard Institute for Space Studies in New York City , a part of the Goddard Space Flight Center in Greenbelt , Maryland , Earth Sciences Division .