He studied at the University of Munich and worked as an assistant under Adolf von Baeyer and Carl von Voit. Later on, he taught as a professor at the University of Marburg, and in 1891 succeeded Robert Koch as a professor of hygiene at the University of Berlin. In 1909 he succeeded Theodor Wilhelm Engelmann as chair of physiology at Berlin. Rubner was co-founder of the Kaiser-Wilhelm Institut für Arbeitsphysiologie, and became its director in 1913. With his assistant Gerhard Albrecht, Rubner set out to study labour not just as the expenditure of energy, but also the use of intellect. They rejectedtaylorism as being over concerned with economic outputs, but rather advocated an approach which was more concerned with a biophysical approach to the elimination of fatigue.
Contributions
Rubner is remembered for his research in metabolism, energy physiology, hygiene and dietarythermogenesis. His best-known research centres on what he termed the "isodynamic law" of calories, according to which the form of humancalorie intake is irrelevant to its effect on energy balance, often paraphrased as "a calorie is a calorie". In 1902, Rubner expressed his belief that this was over-simplistic, stating "the effect of specific nutritional substances upon the glands" may modify the effect of specific foods on energy balance, a view that is now increasingly accepted. With Otto Heubner, he performed important studies involving energy metabolism in infancy. In 1883 Rubner introduced the "surface hypothesis", which stated that the metabolic rate of birds and mammals that maintain a steady body temperature is roughly proportional to their body surface area. Max Rubner is also known for his "rate-of-living theory", which proposed that a slow metabolism increases an animal's longevity. His observation was that larger animals outlived smaller animals and that the metabolic rates of larger animals were slower prorata. The theory might have been inspired by the Industrial Revolution by the logic that the more a machine is worked, the sooner it will wear out.