According to Wikipedia entry of a very famous geneticist "Nikolai Vavilov"
While developing his theory on the centres of origin of cultivated plants, Vavilov organized a series of botanical-agronomic expeditions, collected seeds from every corner of the globe, and created in Leningrad the world's largest collection of plant seeds. This seedbank was diligently preserved even throughout the 28-month Siege of Leningrad, despite starvation; one of Nikolai's assistants starved to death surrounded by edible seeds. Vavilov also formulated the law of homologous series in variation. He was a member of the USSR Central Executive Committee, President of All-Union Geographical Society and a recipient of the Lenin Prize. During most of his career Vavilov was assisted by his deputy Georgy Balabajev.