In 1915 Albert Einstein laid a geometrodynamic foundation for classical gravitational motion based upon least action principles. For an entire century since, although many attempts have been made, we still do not have a comparable theory even of classical electrodynamics, much less quantum electrodynamics.
Since December 2015 I have been focused exclusively on solving that long-standing challenge, aside from diverting for the last few weeks to help mediate a Bell’s Theorem discussion on Retraction Watch at http://retractionwatch.com/2016/09/30/physicist-threatens-legal-action-after-journal-mysteriously-removed-study/.
The latest draft of my paper on geometrodynamic electrodynamics, both classical and quantum, which is substantially complete and ready for journal submission, is available at lorentz-force-geodesics-brief-4-2. As I engage in a final review and revision of this paper prior to submission, I certainly welcome any comments you may have. You may post them here, or email me privately at email@example.com.