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A remarkable theorem due to Peter Dembowski states that if $I$ is aninversive plane of even order $q$ then $q$ must be a power of two and $I$ mustbe the incidence system of points versus plane ovals in an ovoid in theprojective $3$-space over the field of order $q$. In this paper we present ashort and self-contained proof of this result. Our proof depends on theclassification due to Benson of the symmetric and regular finite generalizedquadrangles. Included here is a deduction of Benson's Theorem from theDembowski-Wagner combinatorial characterization of finite projectivegeometries.

Dembowski's Theorem on Finite Inversive Planes of Even Order