[1][2] Metaxas was the royal architect of George I of Greece and is best known for being the architect chosen by George Averoff to restore the Panathinaiko Stadium for the 1896 Summer Olympics in Athens, the birth of the modern Olympic movement, while the design was from Ernst Ziller.

[3] Other works of his include the design for St Andrew's Cathedral, Patras and various public buildings and mansions in Athens.

[1] He firstly competed in the 1896 Summer Olympics in the stadium he helped restore, he entered the 200 metre military rifle and the 300 metre free rifle, three positions and he would end up finishing in fourth place in both events.

[6] Two years later Metaxas won a bronze medal in the trap shooting event at the 1908 Summer Olympics, held in London, tying for third place with British shooter Alexander Maunder, with 57 of 80 targets hit.

[7] In 1912, aged 50, Metaxas made his final Olympic appearance at the 1912 Summer Olympics in Stockholm, Sweden, where he finished sixth in the trap competition and 35th in the 30 metre rapid fire pistol event.