Syed Ali Shah Geelani was a separatist leader in Jammu & Kashmir. He served as the Chairman of All Parties Hurriyat Conference which is a conglomerate of pro-separatist parties in J&K.
source https://www.jagranjosh.com/current-affairs/former-hurriyat-leader-syed-ali-shah-geelani-passes-away-at-92-at-his-residence-in-srinagar-1630560441-1