Career
Ó Rócháin was a qualified teacher who taught mathematics and Irish in Cahersiveen, Waterville, Dublin and Spanish Point. Muiris Ó Rócháin was one of the founders of the Willie Clancy Summer School. He was its director for many years.
Over the years, he spent much time to folklore, community life and especially to Irish culture.
Many organisations availed of his time and knowledge. Amongst others: Dal gCais, journal on Irish culture, Oidhreacht an Chláir Teo (Clare Institute for Traditional Studies). and The Clare Festival of Traditional Singing.
In 2001 Ó Rócháin was appointed as president of the Oireachtas na Gaeilge, an annually held arts festival of Irish culture. Ó Rócháin was involved in the creation of three movies:
1980: My Own Place, by accordion player Tony MacMahon
1991: Story of the Dingle Wren
1992: Cur agus Cuiteamh.