[2] He appeared on programs such as Club Dorothée, 30 millions d'amis, Télématin, and Terre attention danger.

[3] Starting in the 1960s, he made regular television appearances on programs which promoted animal welfare including Je cherche un maître, Les Animaux du monde, 30 millions d'amis and Terre, attention danger on TF1, which he presented for more than ten years with Dorothée.

[2] He proposed the project which led to chapter II of the Law of 10 July 1976, which created protections for animals.

[3] He co-founded the National Council for Animal Protection, and worked with Jacques Chirac to establish the Paris Guide Dog School for the Blind and Visually Impaired (French: l'Ecole des chiens guides pour aveugles et malvoyants de Paris).

[8] Klein published a book on his young adult life, titled Ces Bêtes qui m'ont fait Homme.