 Then Ummenhofer was a Visiting Fellow at Commonwealth Scientific and Industrial Research Organisation Marine and Atmospheric Research in Hobart.Ummenhofer began working at WHOI in 2012.Ummenhofer teamed up with Timothy Walker, a history professor at University of Massachusetts Dartmouth, and Abigail Field, a history major, to collect climate data from log books from whaling ships in the 18th and 19th century.