What did Elbert frank cox do that was I'mportant?

Elbert Frank Cox was the first African American to earn a Ph.D. in mathematics in the United States, achieving this milestone in 1925 from Columbia University. His groundbreaking achievement paved the way for future generations of African American mathematicians and highlighted the importance of diversity in the field of mathematics. Additionally, Cox contributed to academia as a professor and advocate for education, emphasizing the significance of mentorship and access to advanced study for underrepresented groups.