Theodoridis was born in Pyrgos and studied law in Athens.
He was one of the founding members of the Anarchist Association of Pyrgos, a group that tried to associate the Christian religion with social justice.
The group controlled the weekly paper Neon Fos, with Theodoridis being its editor.
The paper, which was founded in 1898, stopped running in 1899.
Theodoridis continued contributing to the local press and Athens-based newspapers, including Kathimerini.