Heinrich Friedrich Emil Lenz (German: [ˈeːmɪl ˈlɛnts]; also Emil Khristianovich Lenz; Russian: Эми́лий Христиа́нович Ленц; 24 February [O.S. 12 February] 1804 – 10 February [O.S. 29 January] 1865), usually cited as Emil Lenz or Heinrich Lenz in some countries, was a Russian physicist of Baltic German descent who is most noted for formulating Lenz's law in electrodynamics in 1834.
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