Due to the OBE stuff somewhere in his background (if not more), seems to be deposited in the applicable sub-forum: Here instead of philosophy or metaphysics.
https://theuniversesolved.com/bio-thomas-campbell.htm
EXCERPTS:
Thomas Campbell (9 December 1944 –) has a Master’s degree in physics from Purdue University and began his career working in the nuclear technology industry. In the early 1970s, he began researching altered states of consciousness with Bob Monroe at the Monroe Institute in Virginia using basic scientific methodologies. Campbell took what he experienced directly and learned from all of the experiments at the Institute and wrote the trilogy “My Big TOE” (TOE stands for “theory of everything”).
[...] The theory in “My Big TOE” is that “all that there is” is an unimaginably huge source of digital consciousness that Campbell calls AUM (absolute unbounded manifold of sequences, patterns, realities, dimensions, and existence. AUM is aware, active, and purposeful. Each of us conscious entities are an individuated subset of AUM, the greater consciousness. Our apparent space-time reality is virtual, a “learning lab” that AUM evolved for us to improve the quality of our consciousness. By having individuated consciousnesses evolve, AUM can itself evolve at a faster rate. He uses “love” as the word to describe how high quality low-entropy consciousnesses interact with others and defines spirituality as “consciousness quality.”
So similar to
Jack Sarfatti, he's another rogue physicist from Hippie Days that the mainstream (if ever encountering him) would believe should be writing speculative fiction instead of nonfiction.
The following isn't even a critical review, yet in the course of it praising Campbell's "My Big Toe" trilogy, it perhaps still unintentionally accomplishes that, via sporting and reveling in the familiar bromides this particular genre is noted for.
My Big Theory Of Everything: Thomas Campbell (review)
https://josephbray.wordpress.com/2012/08/26/my-big-theory-of-everything-thomas-campbell/
Like Christopher Langan's
CTMU, he also has his own web forum:
My Big Toe Forum (Thomas Campbell)
https://www.my-big-toe.com/forums/index.php?sid=c5d515768a479ab844759d6020407f97
_