Bernstein-Szeg\"o measures on the two dimensional torus Greg Knese 42C0530E0547A57reproducing kernelsbidisktwo variable orthogonal polynomialsAnd\hat{o}'s inequalityChristoffel-Darboux formula We present a new viewpoint (namely, reproducing kernels) and new proofs for several recent results of J. Geronimo and H. Woerdeman on orthogonal polynomials on the two dimensional torus (and related subjects). In addition, we show how their results give a new proof of And\^{o}'s inequality via an equivalent version proven by Cole and Wermer. A major theme is the use of so-called Bernstein-Szeg\"{o} measures. A simple necessary and sufficient condition for two variable polynomial stability is also given. Indiana University Mathematics Journal 2008 text pdf 10.1512/iumj.2008.57.3226 10.1512/iumj.2008.57.3226 en Indiana Univ. Math. J. 57 (2008) 1353 - 1376 state-of-the-art mathematics http://iumj.org/access/