NASA Postdoctoral Program (NPP)
The goal of the NPP program is to provide some of the most talented new and senior Ph.D.'s with opportunities to participate in NASA mission-related activities as guests at NASA Centers, Headquarters, and other NASA-approved sites (such as JPL). It provides the opportunity for concentrated research on an annual basis, renewable up to two additional years. Currently, there are over 50 NPP fellows doing their research at JPL.
This program is managed by Universities Space Research Association (USRA). Applications for research opportunities are accepted at anytime, but are evaluated only three times a year beginning November 1, March 1, and July 1. The application process involve the advisor's recommendation as well as evaluation through an independently appointed review panel. Selections are made by JPL and are based on NASA's research priorities, quality of applications, and availability of funding. Appointments are made for one year, but are renewable up to a maximum of three years.
The NASA Postdoctoral Program also offers Senior Fellowships. More information can be found about them here.
More information is available through the USRA NPP Postdoctoral Program website.