Leonard Aurelius is the son of Ares Macrotechnology's founder Nicholas Aurelius. He inherited from him a major stake in Ares' capital, and took the position of CEO and Chairman of the Board of the corporation after his father's final retirement in 2030. The board replaced Leonard Aurelius by Damien Knight in 2033, the same year Nicholas Aurelius died. The relations between Leonard Aurelius and Knight were stormy ever since the Knight's takeover. Leonard Aurelius returned to the position of chairman of the board between 2049 and 2057.
He sold all of his Ares' stock, about 24% of the capital, to Arthur Vogel in 2059 and invested in Cross Applied Technologies, where he now holds a 27% stake. He is a member of the board and the head of Cross Global Development division.
- "To Leonard Aurelius of Ares Macrotechnology, I leave the black king of my antique chess set. May you prove a worthy opponent."
He has two known children: Nicholas (named after his grandfather) who was the head of Cross Advanced Electronics, until his suspicious death in 2074, following the failure of the Excalibur project. After his death, Leonard came back to Ares and took over his son work and projects.