Encouraged and trained by her mother, oral history pioneer Hazel de Berg, Di began work as an oral historian in 1983. Since then her passion for oral history has seen her involved in local history, Aboriginal history, Holocaust history, corporate history, school and family histories. Di is an accredited interviewer for the National Library of Australia and has conducted numerous interviews with notable Australians, including poets, writers, composers, religious leaders, social historians, publishers and singers. She was an interviewer for two of the National Library's major oral history projects - The Australian Response to AIDS, and The Stolen Generation, Bringing Them Home Oral History Project.
In 1987 Di became a member of the Oral History Association of Australia and was an active and highly valued member of the New South Wales Committee from 1992 to 2011. (2011)