[3][2][5] After her graduation, Seppinen took part in master classes with Anne Le Bozec and Riikka Hakola, and studied with Peter Lindroos, Sauli Tiilikainen [fi], and Malcolm Walkers.
[1] She also studied with Tatyana Chitrova in Saint Petersburg, and took part in orchestral conducting courses with Ennio Nicotra [it] in Italy.
[2][5] Other conducting teachers have included Esa-Pekka Salonen, Osmo Vänskä, Jorma Panula, Mikko Franck, John Storgårds, and Herbert Blomstedt.
[2][3] Seppinen's long-time private vocal teacher is Finnish opera singer and mezzo-soprano Eeva-Liisa Saarinen [fi].
[7] In 2005, Seppinen was appointed artistic director of the Helsinki-based academic mixed voice choir Wiipurilaisen Osakunnan Laulajat [fi], also known as WiOL.
[5][6] In 2014, Seppinen conducted the Sibelius Academy's production of the opera Così fan tutte by Wolfgang Amadeus Mozart, and in 2015 she conducted the Academic Female Voice Choir Lyran's, the Academic Male Voice Choir of Helsinki's, and the Helsinki Baroque Orchestra's [fi] production of the Mass in B minor by Johann Sebastian Bach.
[5][6] As a mezzo-soprano, Seppinen has given solo concerts, been part of opera productions, and performed in contemporary music festivals, both in Finland and abroad.