Adolf Eduard Mayer (9 August 1843 – 25 December 1942) was a German agricultural chemist whose work on tobacco mosaic disease played an important role in the discovery of tobacco mosaic virus and viruses in general.
Michel Eugène Chevreul (31 August 1786 – 9 April 1889) was a French chemist whose work with fatty acids led to early applications in the fields of art and science.
 He is credited with the discovery of margaric acid, creatine, and designing an early form of soap made from animal fats and salt.
 He lived to 102 and was a pioneer in the field of gerontology.
 He is also one of the 72 people whose names are inscribed on the Eiffel Tower; of those 72 scientists and engineers, Chevreul was one of only two who were still alive when Eiffel planted the French Tricolor on the top of the tower on 31 March 1889.
Fritz Haber (] ; 9 December 1868 – 29 January 1934) was a German chemist who received the Nobel Prize in Chemistry in 1918 for his invention of the Haber–Bosch process, a method used in industry to synthesize ammonia from nitrogen gas and hydrogen gas.
 This invention is of importance for the large-scale synthesis of fertilizers and explosives.
 The food production for half the world's current population depends on this method for producing nitrogen fertilizers.
 Haber, along with Max Born, proposed the Born–Haber cycle as a method for evaluating the lattice energy of an ionic solid.
Einstein's Gift is a play written by Canadian playwright Vern Thiessen in 2003.
 Through the recollections of Albert Einstein, the play focuses on the life and career of German chemist Dr. Fritz Haber, who helped improve living conditions with his work on nitrogen fixation.
 His work was later used by the German army to produce chlorine gas used in Second Battle of Ypres in the First World War.
 As Dr. Haber becomes increasingly involved with the German army, the play depicts how his actions and newly forged military connections affect his relationship with his wife, Clara, and his assistant, Otto.
 As his passion in science intertwines with nationalistic pride, Haber manifested himself a scientist devoted to a country that never accepted his Jewish origin.
Robert Le Rossignol (27 April 1884 – 26 June 1976) was a British chemist.
 He is most known for his work with Fritz Haber on the fixation of nitrogen from atmospheric air, the Haber process.
John Clark Sheehan (23 September 1915 – 21 March 1992) was an American organic chemist whose work on synthetic penicillin led to tailor-made forms of the drug.
 After nine years of hard work at the Massachusetts Institute of Technology (M.I.T.), he became the first to discover a practical method for synthesizing penicillin V.
 While achieving total synthesis, Sheehan also produced an intermediate compound, 6-aminopenicillanic acid, which turned out to be the foundation of hundreds of kinds of synthetic penicillin.
 Dr. Sheehan's research on synthetic penicillin paved the way for the development of customized forms of the lifesaving antibiotic that target specific bacteria.
 Over the four decades he worked at M.I.T., Sheehan came to hold over 30 patents, including the invention of ampicillin, a commonly used semi-synthetic penicillin that is taken orally rather than by injection.
 His research covered not only penicillin, but also peptides, other antibiotics, alkaloids, and steroids.
Marshall D. Gates, Jr. (1915–2003) was an American chemist, holding the position of C.F. Houghton Professor of Chemistry at the University of Rochester.
 He was an organic chemist whose research was in the field of natural product synthesis.
 He is best known for publishing the first total synthesis of morphine in 1952.
John Motley Morehead III (November 3, 1870 – January 7, 1965) was a chemist whose work provided much of the foundation for the business of Union Carbide Corporation.
 He was a noted philanthropist who made major gifts to his alma mater, the University of North Carolina at Chapel Hill.
 He also served as mayor of Rye, New York and United States Ambassador to Sweden.
 His father was James Turner Morehead; his grandfather John Motley Morehead served as Governor of North Carolina.
 His sister Lily Morehead Mebane was decorated by the governments of France and Serbia for her relief work after World War I; she later served two terms in the North Carolina state legislature.
Haber is a 2008 short-film written and directed by Daniel Ragussis.
 The film recounts the work of Fritz Haber in developing chemical weapons for the German army during World War I.
Jean Charles Galissard de Marignac (24 April 1817 – 15 April 1894) was a Swiss chemist whose work with atomic weights suggested the possibility of isotopes and the packing fraction of nuclei and whose study of the rare earth elements led to his discovery of ytterbium in 1878 and codiscovery of gadolinium in 1880.

Question: What is the date of birth of the chemist whose work was recounted in Haber?
Answer: 9 December 1868