Herman Moritz Kalckar (26 March 1908 – 17 May 1991) was a Danish biochemist who pioneered the study of cellular respiration.
Kalckar made a number of significant contributions to the development of 20th century biochemistry including:
a founder of bioenergetics;
enzymology, including novel assay techniques;
galactose metabolism in both microorganisms and animal tissues;
suggestion that strontium-90 levels in children’s deciduous teeth correlated with nuclear testing.