L%C3%A9on Teisserenc de Bort
Lon Philippe Teisserenc de Bort was a French meteorologist and a pioneer in the field of aerology. Together with Richard Assmann , he is credited as codiscoverer of the stratosphere, as both men announced their discovery during the same time period in 1902. Teisserenc de Bort pioneered the use of unmanned instrumented balloons and was the first to identify the region in the atmosphere around 817 kilometers of height where the lapse rate reaches zero, known today as the tropopause.
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Source: Wikipedia