"At a time when disinformation and misinformation about gender-affirming care are rampant, this book is a much needed scientifically based resource for mental health providers to better understand and appropriately work with trans and nonbinary people. This second edition not only includes more recent research but also expands on how mental health professionals can and must support and advocate for trans and nonbinary communities in the face of bad science and hostile governments." - Genny Beemyn, PhD, Trans Scholar and Director of the Stonewall Center, University of Massachusetts Amherst, Amherst, MA, United States "The new edition of this book is a timely update on an important community at a time when professional support and accurate knowledge are especially crucial. The authors share cutting-edge information and are established experts in their respected areas. This text would be among my top choices for teaching and training in clinical psychology and other mental health fields." - Lauren Mizock, PhD, Core Faculty, Fielding Graduate University, Clinical Psychology PhD Program, Santa Barbara, CA, United States