= Wilhelm Ostwald
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<Wilhelm Ostwald> made <catalysis>, <chemical equilibrium>, and <reaction rates> central subjects of <physical chemistry>. His account of <catalysis> emphasized changes in the speed of a <chemical reaction>; this connects a <catalyst>'s practical effect with the time needed to approach <chemical equilibrium>.<Nobel Lectures, Chemistry 1901–1921/On Catalysis>[Nobel lecture, 12 December 1909; catalyst and reaction-velocity discussion]{ref}
Official lecture page, with a portrait: https://www.nobelprize.org/prizes/chemistry/1909/ostwald/lecture/
\Image[https://upload.wikimedia.org/wikipedia/commons/d/d7/Wilhelm_Ostwald.jpg]
{title=Portrait of <Wilhelm Ostwald>}
{description=Unknown photographer; Smithsonian Institution Libraries source noted on Commons. Public domain (PD-old). Source and usage information on the linked Wikimedia file page.}
{source=https://commons.wikimedia.org/wiki/File:Wilhelm_Ostwald.jpg}
{width=250}
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