Professionals who pioneered transgender medicine were a predominantly cisgender, heteronormative group of clinicians, researchers, and allied specialists—active primarily from the early 20th century through the late 1970s—who developed the earliest systematic, often pathologizing approaches to understanding, supporting, and medically assisting transsexual/transgender people. This cohort included endocrinologists, psychiatrists, psychologists, surgeons, sexologists, social workers, and clinic administrators who, often working without established protocols or institutional support, laid the groundwork for modern gender-affirming care.

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