Uli Hack's parents converted their farm in Germany to biodynamic when he was 7 years old. At 11 he started going to the Waldorf school in Stuttgart. In 1982 Hack's family moved to a farm in Kincardine, Ontario. In 1984 Hack participated in a praktikum on a biodynamic farm in Luxembourg and “Vertiefungswochen” in Dornach. In 1991 he became member of the board of the Society for Biodynamic Farming and Gardening in Ontario and also of the Biodynamic Farming and Gardening Association.
In 1992 Hack took over the production of the preparations on the farm, as his father left to do a project in Russia. In 1994 he took over the certification work for Ontario and later for more Provinces. Hack was a founding member of the Canadian Biodynamic Alliance, and later of Demeter Canada, the holder of the Demeter Biodynamic trademark. In partnership with his brother Martin, Hack operates a 900-acre Demeter-certified farm.