The visibility of transgender and gender nonconforming (TGNC) individuals in society has lagged behind that of sexual minorities (e.g., gay, lesbian, and bisexual). As a result, the focus on unique issues, including health care, for these individuals has also lagged behind—this is particularly true in mental health. The gender minority stress and resilience model demonstrates how the distinct stressors faced by TGNC individuals, including rejection, nonaffirmation, discrimination, victimization, internalized transphobia, and negative expectations, result in increased rates of mental illness and suicidality (1). Unfortunately, many barriers to health care, including mental health care, exist for the TGNC population. In addition to health insurance inequities and socioeconomic barriers, TGNC individuals also cite discrimination and lack of cultural competence by health care providers and, most importantly, a paucity of providers sufficiently knowledgeable on transgender health (2). Until the publication of DSM-5, being transgender was considered a psychiatric disorder. The removal of gender identity disorder, and its replacement with gender dysphoria, was a move in the right direction but still underscores an inherent bias in American psychiatry. This bias is reflected in the lack of education in medical schools and residencies of the specific health issues related to the TGNC population. Some practitioners are clear that they don’t have the appropriate knowledge to treat these individuals, choosing to refer them to other clinicians, while many other practitioners confuse feeling “comfortable” with transgender patients with feeling “competent”—in other words, they don’t know what they don’t know. Eric Yarbrough’s new book, Transgender Mental Health, is a much needed and vital tool for the mental health care practitioner and for all health care providers.