Credits & Contact Info

John W. CarrollIn the spring semesters, 2004-2008, I (John Carroll) taught an honors seminar on the philosophical paradoxes of time travel at NC State University. As part of their course work, students were sometimes given the option to create a web page exploring one of the issues central to the course. The goal was that over time, through their work and with guidance from me, we would create a website on time travel. The thought was that such a website would be of use to students who take the honors seminar (or my metaphysics course) and also be of interest to philosophically curious websurfers. In the Fall of 2005, a small group of honors students began making the website a reality, drawing from some of the best webpages created in the earlier classes. Since then the website has been updated and expanded many times as the result of input from new and former students in HON 341 Time Travel and PHI 330 Metaphysics.

All the students in all these classes have contributed either through their work on their projects or through participation in the class discussions. To date, special credit is due Allyson Hutchinson for bringing together the original layout for the site, the introductory page, and the pages on the self-visitation paradox, the physics of time travel, the nowhere argument and the grandfather paradox. In 2007, Allyson, Sam Harward, Diana Tysinger, and Scott Watkins were valuable consultants on all aspects of the website. In 2012, Neil Shah, Alex Belt, and Daniel Ellis contributed technical advice and work on the animations.

Scott is with NC State’s DELTA (Distance Education and Learning Technology Applications) and is a former metaphysics student. Since 2007, he has been the official web guru of A Time Travel Website. He has been incredibly generous with his time, web knowledge and abilities, and has contributed much philosophical insight in discussions with me and others. In 2011, a grant from the College of Humanities and Social Sciences at NC State provided financial support for Scott to dramatically update the layout and functionality of the site to its present form.

Lisa Fiedor, also a former student and also with DELTA, has been an occasional consultant on web-related matters almost from the start of the enterprise. The wonderful office staff in the Department of Philosophy and Religious Studies at NC State, Ann Rives and Ken Peters, has provided regular proof reading and fun chats; any lingering typos are my fault for fussing with stuff after they cleaned up various drafts.

For a brief history of the student-based origins of the individual topic pages, see the topic-page credits.

To cite a page from this website, use the following format, replacing “page title” with the title of the appropriate page:

 “Page Title.” A Time Travel Website. December 5, 2008. Ed. John W. Carroll. <>.


 “The Double-Occupancy Problem.” A Time Travel Website. November 29, 2008. Ed. John W. Carroll. <>.

The website is a largely a work by my students. I have been closely involved by virtue of being the one to expose the students to the metaphysics of time travel, by virtue of providing substantial editorial guidance, and by writing with them as some of the pages have become more ambitious. I think you will find that it is extraordinary work. I recommend the website to philosophy students, to professional philosophers looking for a class resource, and to anyone who just enjoys thinking carefully about time travel.

I hold the copyright and take responsibility for any errors–philosophical or otherwise. This seemed the appropriate approach given my role in the development of the website and that the student contributors move on and new ones join in. It was made clear at the outset to all concerned that, in the event that there is the opportunity for money to be made from the website, I would see to it that any proceeds would be directed back to NC State University in some manner that directly benefits students. You are welcome to link this website, but I ask that the site only be used for academic purposes. We welcome comments and criticisms.



John W. Carroll, Professor of Philosophy
Department of Philosophy and Religious Studies
North Carolina State University
Raleigh, NC 27695-8103