Abstract: This article reviews Catalyst in Action: Case Studies of High-Impact ePortfolio Practice, edited by Bret Eynon and Laura Gambino. A follow-up to the authors’ earlier volume, High-Impact ePortfolio Practice: A Catalyst for Student, Faculty, and Institutional Learning(Eynon & Gambino, 2017), the new book presents a series of 20 case studies focused on various aspects of ePortfolio practice but with a particular emphasis on pedagogy and professional development. The chapters represent a highly diverse group of institutions, from community colleges to small private institutions to large public and private research universities. The various case studies presented are informative and even inspiring, providing a formidable body of evidence supporting the potential value of ePortfolio practice for students, programs, and institutions and attesting to the growing sophistication of ePortfolio research approaches, pedagogical strategies, and professional development practices. Catalyst in Actionis highly recommended to longtime ePortfolioleaders and practitioners as well as to those new to the field. Publisher: Stylus (Sterling, VA, 2018). ISBN: 9781620368671. List price: $35.00 (U.S.). 380 pages.