I'm not a CHATBURN researcher but from the 1915 history of Shelby County Iowa comes the following:
Among the natives of England, JONAS W. CHATBURN of Harlan, Iowa, deserved to be remembered for his extremely useful life, not only as the pioneer miller of the county, but as a stalwart citizen.As a member of the county board of supervisors, county coroner, and mayor of Harlan, he measured up to the full standard of official usefulness.He sent his children to college, believing in higher education.In January 1873 he went to England, under commission from Gov. Carpenter of Iowa, constituting him emigration agent for Iowa in England.He induced many Englishmen to come to Iowa and to Shelby County.
JONAS WELLINGTON CHATBURN was born in Clitheroe, Lancashire, England, March 11, 1821.His wife, MARY BURTON CHATBURN, was born at Wiswell, Lancashire, England, July 26, 1821.They were married at Whalley Church, Whalley, Lancashire, England, Dec 25, 1839.J.W. Chatburn died at Harlan, Iowa, on March 31, 1902, and his wife died at Harlan, Iowa, March 12, 1900.
I hope this helps someone.