Actor, author, he is the older brother of Sacha Guitry. He was instrumental of having Sacha's first play "Le Page" created on 15 Avril 1902, at Paris, Théâtre des Mathurins. Sacha was 17 and Jean 18. .
Their mother actress Renée Delmas de Pont-Jest born in 1858 died in Paris on 4 July 1902 of tuberculosis.