Afterwards, she attended the Tallinn State Conservatory, Performing Arts Department (now, the Estonian Academy of Music and Theatre) studying under instructor Mikk Mikiver, graduating in 1984.

Some of her most important roles at the Rakvere Theatre were in production of works by: Shakespeare, Oscar Wilde, Tennessee Williams, A. H. Tammsaare, Lydia Koidula, Henrik Ibsen, Bernard Kangro, and Hans Christian Andersen.

Notable roles at the Ugala include those in productions of works by such varied authors and playwrights as: Thornton Wilder, Agatha Christie, Arthur Miller, Victor Hugo, Fyodor Dostoyevsky, Oskar Luts, August Gailit, Ben Elton, Eve Ensler, Hella Wuolijoki, Leo Tolstoy, Astrid Lindgren, Anton Chekhov, Tõnu Õnnepalu, Terry Pratchett, Rainer Werner Fassbinder, and Tom Stoppard, among others.

[11] Kiiri Tamm made her feature-film debut in the role of Ulla in the Olav Neuland directed 1984 historical adventure film Hundiseaduse aegu for Tallinnfilm.

[12] Tamm's most substantial film role to date has been that of Aino in the 2013 Ilmar Raag directed romantic drama Kertu, starring Mait Malmsten and Ursula Ratasepp, for Amrion studios.