Heinrich Dreser (1 October 1860 – 21 December 1924) was a German chemist responsible for the aspirin and heroin projects at Bayer AG. He was also a key figure in creating the widely used modern drug codeine. Dreser was born in Darmstadt. Arthur Eichengrün made the claim, yet unproven, that credit for the discovery of aspirin were stolen from him by Dreser. External links References 19th-century German chemists 1860 births 1924 deaths Bayer people Scientists from Darmstadt 20th-century German chemists