Gerald Massey (1828-1907) was an English poet and self-taught Egyptologist. One result of his studies was to identify the Egyptian god Horus with Jesus. On the subject of Atlantis, Massey claimed that sun-worshipping Atlanteans migrated to Egypt but failed to identify their place of origin. His huge work on ancient Egypt, Ancient Egypt: The Light of the World, is widely available.
>His other major work was A Book of the Beginnings  with an introduction by Leslie Shepard.<
There are extensive websites(a)(b) dealing with his work and his sources(c), which include Thomas Taylor’s translation of Plato’s Critias and Timaeus as well as Proclus’ commentary on Timaeus.
(a) See: https://web.archive.org/web/20170618062721/https://www.masseiana.org/intro.htm
(b) See: https://web.archive.org/web/20190327231447/https://gerald-massey.org.uk/massey/index.htm
(c) Introduction to the Works of Massey (archive.org) *