Andrei Mesinger is a Junior Professor at Scuola Normale Superiore of Pisa who received his PhD at Columbia. Dr. Mesinger was a Hubble Postdoctoral Fellow at the Princeton University Department of Astrophysical Sciences and a Postdoctoral Fellow at the Physics Departments of Yale University and UCLA. His research interests are first light, reionization, high-redshift sources, and modeling techniques.

• Chapter 1: Cosmic Reionization and the First Nonlinear Structures in the Universe, Zolt´an Haiman.- Chapter 2: Physics of the Intergalactic Medium during the Epoch of Reionization, Adam Lidz.- Chapter 3: Quasars as Probes of Cosmological Reionization, Daniel J. Mortlock.- Chapter 4: Observing the Epoch of Reionization with the Cosmic Microwave Background, Christian L. Reichardt.- Chapter 5: The 21-cm Line as a Probe of Reionization, Steven R. Furlanetto.- Chapter 6: Constraining Reionization with Lya Emitting Galaxies, Mark Dijkstra.- Chapter 7: Metal Enrichment in the Reionization Epoch, Andrea Ferrara.

"This is an excellent introduction to the 'Epoch of Reionization'. ... It is very timely, as it is a relatively new frontier in several senses ... . this is an excellent collection of articles that give a balanced and comprehensive review of the state of the subject, and it is thoroughly recommended for students embarking on the topic, for the wider community of cosmologists, and for experts in the field, who will probably also learn something new as well." (Alan Heavens, The Observatory, Vol. 137 (1256), February, 2017)