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He studied church and school music, conducting, Catholic theology and musicology at the Musikhochschule Saarbrücken and the University of Saarland, and studied organ improvisation under Jean-Pierre Leguay in Paris.
In 1973, he participated as a researcher at the University of Saarland in Saarbrücken under the direction of Rolf Hachmann in the excavations at Tell Kamid al lawz (or Kamid el-Loz) (Kumidi) in Lebanon part.
In 1974 he was a research associate at the University of Saarland at the of Winfried Orthmann directed excavation of the 5000 year old city of Tall plant Munbāqa (also Ekalte (Mumbaqat)) in Northern Syria.
Born in Gau-Algesheim, Hassemer was from 1964–1969 a scientific assistant at the Institut for laws and social philosophy of the university of Saarland.