John has voiced a variety of characters and impressions in podcasts and commercials. From an exiled starfish alien prince named Hama in the podcast Damocles Clash: Intergalactic Repoman, to a Magic Mike style Matthew McConaghey impression for Maker's Mark whiskey.

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He and his brother, Anthony Maddaloni, host a movie podcast called CineMadic in which they discuss a variety films both old and new. Episodes are released monthly.