There are 13 books by Jeffrey O'Callaghan on BookOrb. A strong starting point is The Imagineer's Chronicles 2007 thru 2010 (2010). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Showing 11 of 13 titles.
Frequently asked questions
How many books has Jeffrey O'Callaghan written?
BookOrb lists 13 books by Jeffrey O'Callaghan.
Where should I start with Jeffrey O'Callaghan?
A good starting point is The Imagineer's Chronicles 2007 thru 2010 (2010).
What is the Jeffrey O'Callaghan books in order list?
In publication order: 1. The Imagineer's Chronicles 2007 thru 2010 (2010), 2. Imagineer's Chronicles 2011 (2011), 3. Reality of the Fourth Spatial Dimension (2012), 4. Imagineer's Chronicles Vol. 4 2013 (2013), 5. Imagineer's Chronicles Vol. 6 2015 (2015), 6. Road to Unification Part 1 2007 Thru 2010 (2020), 7. Road to Unification Part 2 2011 Thru 2014 (2020), 8. Road to Unifying QM with Relativity Part 3 2015 Thru 2020 (2020), 9. Road to Unification Part 3 2015 Thru 2020 Jeffrey O'Callaghan (2020), 10. Road to Unification Part 3 2015 Thru 2020 (2020), 11. Einstein's Explanation of the Unexplainable (2022).