In the early 1860s he emigrated to New Zealand, and in 1862 became the co-owner of The Southern Cross newspaper in Auckland. Following that newspaper"s purchase by Julius Vogel in 1868, Creighton established the short-lived Free Press. He later served as editor of the New Zealand Times and the New Zealand Herald.
Creighton represented the Parnell electorate from 1865 to 1866, when he retired.
He then represented the Newton electorate from 1869 to 1870, when he retired. He then represented the Eden electorate from 1871 to 1875, when he retired.
Creighton moved to San Francisco, where he was agent for the Government of New Zealand.
He was an apprentice compositor with the Londonderry Sentinel, before becoming a reporter and then member of the editorial staff of that newspaper. During a short residence at Honolulu, he became a member of the Government of Hawaii.