Preface: Sasha Alexandrov\nReminiscences of the Early Days of Polaron Theory; Emmanuel I. Rashba\nPart 1: Large and Small Polarons\nOptical Properties of Few and Many Frvhlich Polarons from 3D to 0D; Jozef T. Devreese\nSmall Polarons: Transport Phenomena; Yurii A. Firsov\nMagnetic and Spin Effects in Small Polaron Hopping; Harald Bvttger, Valerij V. Bryksin, and Thomas Danker\nSingle Polaron Properties in Different Electron Phonon Models; V. Cataudella, G. De Filippis and C.A. Perroni\nPath Integrals in the Physics of Lattice Polarons; Pavel Kornilovitch\nPath Integral Methods in the Su-Schrieffer-Heeger Polaron; Marco Zoli\nPart 2: Bipolarons in Multi-Polaron Systems\nSuperconducting Polarons and Bipolarons; A.S. Alexandrov\nSmall Adiabatic Polarons and Bipolarons; Serge Aubry\nFrom Single Polaron to Short Scale Phase Separation; V.V. Kabanov\nPart 3: Strongly Correlated Polarons\nNumerical Solution of the Holstein Polaron Problem; H. Fehske and S.A. Trugman\nLang-Firsov Appraches to Polaron Physics: From Variational Methods to Unbiased Quantum Monte Carlo Simulations; Martin Hohenadler and Wolfgang van der Linden\nSpectroscopic Properties of Polarons in Strongly Correlated Systems by Exact Diagrammatic Monte Carlo Method; A.S. Mishchenko, and N. Nagaosa\nPart 4: Polarons in Contemporary Materials\nPhotoinduced Polaron Signatures in Infrared Spectroscopy; Dragan Mihailovic\nPolarons in Colossal Magnetoresistive and High-Temperature Superconducting Materials; Guo-meng Zhao\nPolaron Effects in High-Temperature Cuprate Superconductors; Annette Bussmann-Holder and Hugo Keller\nCurrent Rectification, Switching, Polarons, and Defects in Molecular Electronic Devices; A.M. Bratkovsky\nIndex