Born in New York City, Heintz grew up in
Bærum, a daughter of
Anatol Heintz and Mary Solnørdal. She was married to geologist Thor Siggerud. Her scientific research specialized in fossil fish. She worked for the
Paleontologisk Museum in Oslo from 1967 to 2000. She has been editor of the
Norwegian Journal of Geology, was a member of several governmental committees, and was an honorary member of
Norges Museumsforbund. Heintz died in
Bærum on 28 November 2025, at the age of 95. ==References==