Dr. Bhimrao Ramji Ambedkar, born on April 14, 1891, was a social reformer and the chief architect of the Indian Constitution, championing the rights of the marginalized and advocating for social justice, particularly for the untouchables and women. Throughout his career, he established organizations, wrote extensively on social issues, and pushed for significant reforms, including the abolition of untouchability and the introduction of reservations for Scheduled Castes. He converted to Buddhism in 1956, promoting its principles as a means of social equality and reform, before passing away later that year.