Dionysius Atticus of Pergamon was a rhetorician, sophist, historian, and speechwriter of ancient Greece, who lived around the 1st century BCE, and was probably born around 80 BCE.
[1][2][3][4] He was a pupil of the celebrated Apollodorus of Pergamon, tutor of the Roman emperor Augustus.
Dionysius was himself a teacher of rhetoric, and the author of several works, in which he explained the theory of Apollodorus.
[7] He also may be the same person as the Vipsanius Atticus described by Seneca the Elder as a disciple of Apollodorus from Pergamon, but there is also no consensus around this.
Dictionary of Greek and Roman Biography and Mythology.