El Hadj Malick Sy was a prominent Senegalese religious leader and founder of the Tidian branch of Sufism. Born in 1855 in Tivaouane, he played a crucial role in spreading Islam in Senegal and promoting education and social welfare. He is best known for his efforts to unite various Muslim communities and for establishing numerous schools and mosques. His teachings emphasized spiritual development and community service, making him a respected figure in Senegalese society. El Hadj Malick Sy passed away in 1922, but his legacy continues to influence many in the region.