Since 1991 she has been a senior researcher at the Department of Sociology and Social Gerontology at the Vrije University. Her main tasks were facilitating interdisciplinary research programs at the university and handling public relations. Since 1998 she participates in the LASA-program. By education a methodologist, she has worked mainly in the areas of public health and gerontology. Since 1991, she is appointed as an associate professor of social epidemiology in the Vrije Universiteit Amsterdam, department of Psychiatry.
International experience is highlighted by the following.
In 1989, she published a volume on Experiences from Longitudinal Studies of Aging, which included an inventory of 72 studies across the world, three of which were described in detail regarding conceptualization, organization and output. From September 1990 through February 1991, Dr. Deeg was a visiting scholar at the Tokyo Metropolitan Institute of Gerontology, department of Community Health, to study predictors of longitudinal change in physical, mental and social functioning. She graduated in 1996 with a major in Human Movement Sciences. She examines risk factors for cognitive decline in elderly persons within LASA, focussing on the role of the apolipoprotein E e4 polymorphism. The study is supervised by Dr. Jonker, Dr. Deeg, Prof. Bouter and Prof. Eikelenboom.