Named after Gene Roddenberry - American engineer, television producer (1921-1991).
Roddenberry is approximately 139 km in diameter. The crater's name was formally approved by the IAU in 1994. To the southwest is the crater Green. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Mars large craters are named after deceased scientists, writers and others who have contributed to the lore of Mars. Small creaters (less than 60km) are named after small towns and villages.