Perry Greenfield did thesis at M.I.T. Physics Ph.D. on Very Large Array radio observations of the first discovered gravitational lens. He worked briefly as a communications engineer at Bell Labs before joining the Space Telescope Science Institute in 1985. He was initially responsible for calibrating the Faint Object Camera for the Hubble Space Telescope. He then moved on to lead the Science Software Branch. For the past 14 years, Perry and his group have pioneered the use of Python in astronomy. They have developed PyRAF, numarray (the precursor to NumPy), and PyFITS. They were also instrumental in the development and support of matplotlib. They are now involved in developing the science software to support the next large space telescope under construction, the James Webb Space Telescope. He is one of the coordinators for the Astropy Project.