Name: Kiai Haji Abdurrazaq Fachruddin
Place, date of birth: Yogyakarta, February 14, 1916
Short biography:
Kiai Haji Abdur Rozak Fachruddin, known as A.R. Fachruddin or Pak AR, was born on February 14, 1916 in Pakualaman, Yogyakarta. He served as the General Chairman of Muhammadiyah from 1968 to 1990, making him the longest-serving leader in the history of the organization. Pak AR is known for his simplicity, honesty, and sincerity in leading and preaching.

In addition to being an organizational leader, Pak AR is also a prolific writer. Here are some of his written works:
1. Naskah Kesyukuran
2. Serat Kawruh Islam Kawedar
3. Syahadatain Kawedar
4. Questions and Answers Entheng-Enthengan
5. Return to the Qur'an and Hadith

Source:
https://www.smkmuhammadiyah5kisaran.sch.id/read/108/biografi-ar-fachruddin-pimpinan-muhammadiyah-yang-bersahaja
https://repository.uinjkt.ac.id/dspace/bitstream/123456789/12479/1/DIANA%20SALIM%20RAHMAN-FAH.pdf
https://repository.unej.ac.id/jspui/bitstream/123456789/88616/1/FITRIA%20EKA%20IMSAWATI%20-%20120210302033%20-%20unej.pdf