Martin Lings (also known as Abu Bakr Siraj Ad-Din) (January 24, 1909 – May 12, 2005) was an English Muslim writer and scholar, a student and follower of Frithjof Schuon, and Shakespearean scholar. He is best known as the author of a very popular and positively reviewed biography, Muhammad: His Life Based on the Earliest Sources, first published in 1983 and still in print.

Lings was born in Burnage, Manchester in 1909 to a Protestant family. The young Lings gained an introduction to travelling at a young age, spending significant time in the United States due to his father's employment. Lings attended Clifton College and went on to Magdalen College, Oxford, where he gained a BA in English Language and Literature. At Magdalen, he was a student and then a close friend of C. S. Lewis. After graduating from Oxford Lings went to Vytautas Magnus University, in Lithuania, where he taught Anglo-Saxon and Middle English.

For Lings himself, however, the most important event whilst at Oxford was his discovery of the writings of the René Guénon, a French metaphysician and Muslim convert, and those of Frithjof Schuon, a German spiritual authority, metaphysician and Perennialist. In 1938, Lings went to Basle to make Schuon's acquaintance and he remained Frithjof Schuon's disciple and expositor for the rest of his life.^{[citation needed]}

Hamza Yusuf Hanson is an American Islamic scholar, and (with Zaid Shakir and Hatem Bazian) is co-founder of Zaytuna College in Berkeley, California, United States. He is a convert to Islam, and is one of the signatories of A Common Word Between Us and You, an open letter by Islamic scholars to Christian leaders, calling for peace and understanding. He has described the 9/11 attacks as "an act of 'mass murder, pure and simple'". Condemning the attacks, he has also stated "Islam was hijacked ... on that plane as an innocent victim".The Guardian newspaper in the United Kingdom reported that he "is arguably the west's most influential Islamic scholar" and added that "many Muslims find his views hard to stomach."

Hamza Yusuf was born to two academics in Washington State and raised in Northern California. In 1977, he became Muslim and subsequently traveled to the Muslim world and studied for ten years in the United Arab Emirates, Saudi Arabia, as well as North and West Africa. Hamza Yusuf spent four years studying in the United Arab Emirates and elsewhere in the Middle East. Later he traveled to West Africa and studied in Mauritania, Medina, Algeria, and Morocco under such scholars as Murabit al Haaj; Baya bin Salik, head of the Islamic court in Al-'Ain, United Arab Emirates; Muhammad Shaybani, Mufti of Abu Dhabi; Hamad al-Wali; and Muhammad al-Fatrati of Al Azhar University in Cairo, Egypt.^{[citation needed]} After more than a decade abroad, he returned to the United States and earned degrees in nursing from Imperial Valley College and religious studies at San José State University.^{[citation needed]}