The son of Colonel John Joseph O'Sullevan DSO, resident magistrate at Killarney, and Vera (née Henry), Peter O'Sullevan was born in Kenmare, Ireland, and educated at Hawtreys, Charterhouse, and later at Collège Alpin International Beau Soleil in Switzerland.
The son of Colonel John Joseph O'Sullevan DSO, resident magistrate at Killarney, and Vera (née Henry), Peter O'Sullevan was born in Kenmare, County Kerry but raised in Surrey, England. He was educated at Hawtreys, Charterhouse, and later at Collège Alpin International Beau Soleil in Switzerland.