What famous artist oversaw the work of the parthenon frieze what does the frieze depict?

The artist was Pheidias. The frieze depicted the Panathenaic procession.

It was the sculptor and architect Phidias. Not only did he supervise the works on Parthenon, but he also made one of the most famous statues ever, Zeus at Olympia. This statue was considered one of the Seven Wonders of the Ancient World, but unfortunately, it no longer exists. Only scarce descriptions of it have survived, from a couple of written sources

∵they depict sad lonely people  ∵  figures in them have long limbs and faces, similiar in style to paintings by el greco.