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Dr. Julius Robert Mayer (1814-1878) aka (Julius von Mayer)
Born in Heilbronn, 25th November 1814.
A German physician and physicist and one of the founders of thermodynamics. He is best known for enunciating in 1841 one of the original statements of the conservation of energy or what is now known as one of the first versions of the first law of thermodynamics, namely that "energy can be neither created nor destroyed".
Died 1878 after illness, aged 63.
1878 Obituary 
1878 Obituary