Set against the backdrop of the “Women’s Decade” (1975–1985) and landmark legislation like Title IX, this chapter chronicles the rise of pioneering women in radiation oncology. It explores how a new, more legally inclusive landscape in the United States fostered opportunities for women and other underrepresented groups in medicine. The chapter highlights the indispensable role of mentorship and sponsorship, detailing the careers of trailblazers whose paths were shaped by influential mentors. A central focus is the work of Dr. M. Vera Peters, whose landmark research fundamentally challenged the standard of radical mastectomy and established the foundation for breast-conserving therapy. The chapter also details the influential careers of other pioneers, including Dr. Sarah Donaldson, Dr. Florence Chu, Dr. Sucha Asbell, and Dr. Ivy O. Brooks, who broke barriers in clinical practice, research, and leadership, paving the way for future generations in the field.