In the fall of 1854, he moved to
Omaha, Nebraska, which had been organized as the
Nebraska Territory in May of that year. He served as a member of the Legislative Council in the first and second sessions of the Territorial
Nebraska Legislature. He took a prominent part in framing the laws of
Nebraska and was one of the three commissioners to codify those laws. In 1855, Origen D. Richardson accompanied
John Milton Thayer on a diplomatic mission to meet with
Pawnee leaders in the
Nebraska Territory. The meeting followed reports of Pawnee raids on settlers in the Elkhorn Valley, after which Acting Territorial Governor
Thomas B. Cuming instructed Thayer, then a major general in the territorial militia, to lead a council aimed at stabilizing relations. ==Family life==