James Q. Jacobs is an American anthropologist/archaeologist, who, to the best of my knowledge, has not ventured into the choppy waters of atlantology. However, he has commented on many peripheral subjects covered in Atlantipedia.
He rationalised the incredible time spans found in ancient Indian literature, by suggesting that the numbers referred to related to days rather than years(a). He has also written extensively on archaeology(b). His website(c) has many articles devoted to pre-Columbian America, both North and South.
Geodesy is another of his interests about which he has written a useful introduction(d).
Louis Léon de Rosny Prunol (1837- 1914) was a French ethnologist and linguist, becoming the first teacher of Japanese in France. He also had an interest in pre-Columbian America. In an 1876 book on the ancient script of the Maya, he identified Central America as the location of Atlantis. In a later volume he returned to the subject again.