Liberal democracy, also known as constitutional democracy, is a common form of representative democracy. According to the principles of liberal democracy, elections should be free and fair, and the political process should be competitive. Political pluralism is usually defined as the presence of multiple and distinct political parties.

A liberal democracy may take various constitutional forms: it may be a constitutional republic, such as France, Germany, India, Ireland, Italy, or the United States, or a constitutional monarchy, such as Japan, Spain, or the United Kingdom. It may have a presidential system (Argentina, Brazil, Mexico, the United States), a semi-presidential system (Finland, France, Taiwan), or a parliamentary system (Australia, Canada, India, New Zealand, Poland, the United Kingdom).

The Liberal democracies usually have universal suffrage, granting all adult citizens the right to vote regardless of race, gender or property ownership. Historically, however, some countries regarded as liberal democracies have had a more limited franchise, and some do not have secret ballots. There may also be qualifications such as voters being required to register before being allowed to vote. The decisions made through elections are made not by all of the citizens, but rather by those who choose to participate by voting.

John Louis Esposito (born 19 May 1940, Brooklyn, New York City) is a professor of International Affairs and Islamic Studies at Georgetown University. He is also the director of the Prince Alwaleed Bin Talal Center for Muslim-Christian Understanding at Georgetown University.

Esposito was raised a Roman Catholic in an Italian neighborhood in Brooklyn, New York City, and spent a decade in a Catholic monastery. After taking his first degree he worked as a management consultant and high-school teacher.^{[citation needed]} He then studied and received a masters in theology at St. John's University. He earned a PhD at Temple University, Pennsylvania in 1974, studying Islam and held postdoctoral appointments at Harvard and Oxford. He is well known as a promoter of strong ties between Muslims and Christians and has challenged the Vatican to make greater efforts to encourage such ties ^{[citation needed]}

For nearly twenty years after completing his PhD, Esposito had taught religious studies (including Hinduism, Buddhism and Islam) at the College of the Holy Cross, a Jesuit college in Massachusetts. At Holy Cross, Esposito held the Loyola Professor of Middle East Studies position, was the chair of the Department of Religious Studies, and the director of college's Center for International Studies. At Georgetown University, Esposito holds the position of University Professor and teaches as both Professor of Religion and International Affairs and Professor of Islamic Studies. Esposito also works as a Senior Scientist at the Gallup Center for Muslim Studies, where he co-authored Who Speaks for Islam? What a Billion Muslims Really Think, which was published in March 2008.

Sherman A. Jackson (also known as Abdul Hakim Jackson) is an American scholar. He is the King Faisal Chair of Islamic Thought and Culture and Professor of Religion and American Studies and Ethnicity at the University of Southern California. He was formerly the Arthur F. Thurnau Professor of Near Eastern Studies, Visiting Professor of Law and Professor of Afro-American Studies at the University of Michigan.

He received his Ph.D. from the University of Pennsylvania and has taught at the University of Texas at Austin, Indiana University, Wayne State University and the University of Michigan. From 1987 to 1989, he served as Executive Director of the Center of Arabic Study Abroad in Cairo, Egypt. He is author of several books, including Islamic Law and the State: The Constitutional Jurisprudence of Shihâb al-Dîn al-Qarâfî (E.J. Brill, 1996), On the Boundaries of Theological Tolerance in Islam: Abû Hâmid al-Ghazâlî's Faysal al-Tafriqa (Oxford, 2002), Islam and the Blackamerican: Looking Towards the Third Resurrection (Oxford, 2005) and Islam and the Problem of Black Suffering (Oxford, 2009).

Nicholas Wolterstorff (born January 21, 1932 in Edgerton, Minnesota) is an American philosopher and currently the Noah Porter Emeritus Professor of Philosophical Theology at Yale University. A prolific writer with wide-ranging philosophical and theological interests, he has written books on aesthetics, epistemology, political philosophy, philosophy of religion, metaphysics, and philosophy of education. In Faith and Rationality, Wolterstorff, Alvin Plantinga, and William Alston developed and expanded upon a view of religious epistemology that has come to be known as reformed epistemology. He also helped to establish the journal Faith and Philosophy and the Society of Christian Philosophers.

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While an undergraduate at Calvin College, Wolterstorff was greatly influenced by professors Harry Jellema, Henry Stob and Henry Zylstra, who introduced him to schools of thought that have dominated his mature thinking: Reformed theology and common sense philosophy (these have also influenced the thinking of Wolterstorff's friend and colleague Alvin Plantinga, another alumnus of Calvin College).

Timothy Ferris (born August 29, 1944) is a science writer and the best-selling author of twelve books, including The Science of Liberty (2010) and Coming of Age in the Milky Way (1988), for which he was awarded the American Institute of Physics Prize and was nominated for the Pulitzer Prize. He also wrote The Whole Shebang: A State-of-the-Universe(s) Report (1997), a popular science book on the study of the universe.

Ferris is a native of Miami, Florida, and a graduate of Coral Gables High School. He attended Northwestern University, graduating in 1966, and studied for one year at the Northwestern University Law School before joining United Press International as a reporter, working in New York City.

After starting his career as a newspaper reporter, Ferris became an editor at Rolling Stone magazine. Ferris produced the Voyager Golden Record, an artifact of human civilization containing music, sounds of Earth and encoded photographs launched aboard the Voyager 1 spacecraft. He has served as a consultant to NASA on long-term space exploration policy, and was among the journalists selected as candidates to fly aboard the Space Shuttle in 1986. He was also a friend of and collaborator with American astronomer Carl Sagan.