He has co-authored the screenplay of "Jüri Rumm", a popular Estonian film (of 1994).
His novel "Üksindus on hommikuti hell" (Loneliness is tender in the morning) has been translated into Russian (Russian: Oda utrennemu odinočestvu), was published in the literary journal Neva.
Käsper's work "Saksamaa õppetunnid”" (The Lessons of Germany) won a yearly prize of the Russian magazine Zvezda, where this translation was published.
[1] In recent years, Käsper has published in Estonian newspapers comments on politics and current affairs, distinguished by criticism towards the developments in post-Soviet Estonia and disapproval of cultural Americanisation.
Käsper as a publicist is also supportive of Russia and Russian president Vladimir Putin[2] and has expressed nostalgic attitudes to some aspects of the Soviet period.