The International Delaunay Laboratory of Discrete and Computational Geometry introduces a new books series: the Delaunay Library. We open the series with the First Yaroslavl Summer School on Discrete and Computational Geometry, which contains lecture notes accompanying the short courses delivered in July and August of 2012. We hope this volume will be useful to all students and post graduates interested in the current state-of-the-art in this field. Funded by Russian Government Grant 220 / Contract 11.G34.31.0053/