Good for Larry, and the others in "camp #1" (below) who routinely do the same.
I think there are (at least) two camps anyway, and Larry wouldn't be worried about sitting on a panel with "authors" from another camp.
I'd put Swedroe, Ferri, Bernstein, Burns, Bogle, Schultheis & the Boglehead authors in camp #1 - though I am sure I am missing other important sources. And I'd put most of the others in camp #2 etc. You can usually recognize them by the attention grabbing titles to their books, articles, etc. - oldest trick in the book and yet it still works like a charm. "Dow 36,000" (in 1999 with PE's already thru the roof) - puhleeeze. Same nonsense that has given us thousands of diet books that sell like hotcakes and don't work.
When I do see those in camp #1 sitting on panels or serving as counterpoint on talk shows (it does happen), the camp #1 folks seem to acquit themselves well and easily. Though that's probably a reflection of my own financial biases.
My 2 cents...
No one agrees with other people's opinions; they merely agree with their own opinions -- expressed by somebody else. Sydney Tremayne
Retired Jun 2011 at age 57
Target AA: 60% equity funds / 35% bond funds / 5% cash
Target WR: Approx 2.5% Approx 20% SI (secure income, SS only)