From this year, Professor Seiji Ukai will step down from the managing
editorial board of KRM. Seiji Ukai is a world leading expert in the ﬁeld of
mathematical theories of kinetic equations. He is the ﬁrst one who proved the
global existence of solutions to the space inhomogeneous Boltzmann equation
in 1974, and he has been making important contributions to this area,
including his series of recent works on the Boltzmann equation without angular
cutoff. We are deeply indebted to the contributions that Seiji made to
the area and the journal and wish him all the best in the future.
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