He was a visiting professor at universities in Pakistan, Austria, Germany, Scandinavia, and the United States, teaching at departments of anthropology, history, religion, and sociology.
He is the author of five books and numerous articles on Islam, the Middle East, North Africa, and Central and South Asia, covering both history and current affairs.
For more than a decade, Khalid was employed as a human rights and country conditions consultant by Princeton, New Jersey based Political Asylum Research, owned and directed by Michael A. Pellerin.
In this capacity Khalid contributed substantively and pivotally to the asylum claims of countless petitioners fleeing persecution, torture and extrajudicial killings throughout the Islamic world.
He was a uniquely good and decent man, voice of reason, intellectual honesty and decency, acclaimed scholar of Islam, citizen of the world, one who found evil and tried to right it, knew of justice and tried to attain it, had a conscience and felt morally compelled to follow it.