In Memoriam Stepan G. Shiyatov 1933–2021

StepanGrigorievich Shiyatov diedOctober 23, 2021, in Yekaterinburg, Russia. Professor Shiyatov was a leading pioneer of dendroecological and dendroclimatic studies in northern Eurasia and internationally. He had a well-deserved reputation for rigor in the central process of dendrochronology– crossdating. He early tackled other basic problems such as detrending of ring-width series and the realworld frequency distributions of ring widths. He knew his material, from the field context to the properties of the measured series. This, and his generousmentoring of colleagues at his own laboratory and across Russia and the former USSR, as well as internationally, led to the work for which he is best known in dendrochronology: the long-term temperature reconstructions from Siberian tree-ring networks and the Yamal multi-millennial chronology. He was born December 24, 1933, in Vladimirovka village, Zilair District, eastern European Russia. After high school he entered the Forestry Department of the Ural Forestry Institute (Sverdlovsk, now Yekaterinburg). As a student, he took part in several expeditions to the Subpolar and northern Urals. This stimulated his interest in vegetation growing at the upper limit of its latitudinal and elevational distribution. His graduation thesis, and first scientific work, was about the ecology and diversity of open woodlands and crooked forests, as well as the altitudinal patterns and spatial distribution of the upper forest limits within theKytlymMountains (NorthernUrals). After this, he worked for one year in the forestry industry until, in 1958, he joined the Ural Forest Experimental Station (Sverdlovsk) as a Research Assistant where he studied reforestation of concentrated felling areas and assessment of their fire hazard. In the fall of 1959 he enrolled in the postgraduate program at the Institute of Biology of the Ural Branch of