Although Hafiz Ibrahim known as Qarahisari does not appear to be recorded in the main sources on Ottoman calligraphers, his master Mahmud Jalal al-Din (Mahmud Celaleddin Efendi, d.1829) was a celebrated Ottoman calligrapher of the late 18th and early 19th century. He wrote an important Qur'an that was owned by Sultan 'Abd al-'Aziz's eldest daughter, Nazime Sultan, which sold at Christie's, King Street, 8 October 2015, lot 123.
Mahmud Jalal al-Din is said to have taught himself calligraphy by studying the work of various masters. He developed a distinctive style, referred to by Derman as a 'hard and static' and relating more closely to the calligraphic mode of Ahmad Qarahisari or Yaqut al-Musta'simi than to the cursive naskh of Shaykh Hamdullah that was favoured by his contemporaries (M. Ugur Derman, Letters in Gold, exhibition catalogue, New York, 1998, p.108). Several levhas by Mahmud Celâleddin are in the Museum for Turkish and Islamic Art. Another, dated AH 1204/1789-90 AD, is in Konya (Mehdi Bayani, Ahval va Asar-e Khosh-Nevisan, Tehran, 1363/1984, p.1210). Another of Jalal al-Din's students, Muhammad Tahir Efendi (Mehmed Tahir Efendi, d. 1848) taught calligraphy to Sultan 'Abd al-Majid (r. 1839-61).
Another Qur'an signed Hafiz Ibrahim sold at Christie's South Kensington, 5 October 2012, lot 613. Although that scribe appears to have been a pupil of Muhammad al-Wasfi.