The American Psychological Association (APA) is the nation's largest organization of psychologists. It consists of clinicians who treat patients with psychological disorders like depression and anxiety and academics who teach and do psychological research, among other types of psychologists. This fortunate combination of practitioners and scholars has enabled an evidence-based approach to clinical practice. APA has a long history of developing guidelines for psychological practice through collaboration between scientists and practitioners. Practice Guidelines have been developed both for specific groups such as girls and women, older adults, racial and ethnic minority groups, transgender and gender non-conforming people, and sexual minority persons, and for specialized practice areas such as telepsychology or forensic psychology.