Found this site
Burton Holmes, Extraordinary Traveler
There's a history article that details his company continued on after his death and branched out into holography. Found this snippet interesting regarding archives found in storage units.
"BHI never dissolved the California corporation founded in 1958, but simply went inactive. At times it called itself Burton Holmes International, probably during the cash-crunch years when it couldn't keep up its corporation license fees.
Hololabs, the separate company with Dave Schmidt, was dissolved in 1986. Hollingsworth, by this time living in Costa Mesa, California, died of heart failure in March, 1989. Mallett died in Newport Beach, California, in September 2000. What both of these gentlemen had been doing in the intervening years is unknown, as is the final destination of the records, scrapbooks, the archvies of BHI. If anyone can help us fill in the record it would be greatly appreciated; contact us, please.
In June of 1978, renowned cinematographer Bill Cartwright, aided by Scott Goren and Genoa Caldwell, spent many days inspecting the BHI film Archives, frame by frame, and they created a detailed log of all the films still in BHI's possession. As he put it in a letter to us, "Then in the next four years, the Burton Holmes company and the Archives fell off the radar screen. It is now a lost treasure, and there's not a hint of how such an important collection could be lost. It was too large a collection to casually dispose of, and one could not have been so unaware of its money value, even if they did not realize its historic importance. The real question is, does it still exist, and in what condition and where?"
What seems to be the major part of the film archive turned up in storage in Hollywood, in 2004. Is there more to be found? The rest of the film archive? The scrapbooks, the files? Are they lost forever? Maybe they're all just sitting in a storage locker in Pasadena, waiting for us to find them. We can hope."