Theon of Alexandria

Theon of Alexandria (; ;  335 – c. 405) was a Greek scholar and mathematician who lived in Alexandria, Egypt. He edited and arranged Euclid's "Elements" and wrote commentaries on works by Euclid and Ptolemy. His daughter Hypatia also won fame as a mathematician.
Life.
Little is known about the life of Theon. He made predictions and observations of solar and lunar eclipses in 364 which show he was active at that time, and he is said to have lived during the reign of Theodosius I (379–395). 
The "Suda", a tenth-century Byzantine encyclopedia, calls Theon a "man of the Mouseion". However, both the Library of Alexandria and the original Mouseion were destroyed in the first century BC and according to classical historian Edward J. Watts, Theon was probably the head of a school called the "Mouseion", which was named in emulation of the Hellenistic Mouseion that had once included the Library of Alexandria, but which had little other connection to it. Theon's school was exclusive, highly prestigious, and doctrinally conservative. Neither Theon nor his daughter Hypatia seems to have had any connections to the militant Iamblichean Neoplatonists who taught in the Serapeum of Alexandria and instead preferred Plotinian Neoplatonism.
Theon was the father of the mathematician Hypatia, who succeeded him as head of his school Theon dedicated his commentary on the "Almagest" to a boy named Epiphanius, who may have been his son. Also, in his commentary on the "Almagest" he states that his daughter Hypatia contributed to Book III of the "Almagest" stating "the edition having been prepared by the philosopher, my daughter Hypatia."
A lunar crater, Theon Junior, now bears Theon's name.
Works.
Edited works.
It is known that Theon edited the "Elements" of Euclid. He may also have edited some other works by Euclid and Ptolemy, although here the evidence is less certain. The editions ascribed to Theon are:
Commentaries.
Of his commentaries, those which are extant are:
Original works.
Among Theon's lost works, the "Suda" mentions "On Signs and Observation of Birds and the Sound of Crows"; "On the Rising of the Dog[-Star]"; and "On the Inundation of the Nile".