It's likely you're thinking of:
* Malachy McCourt: A well-known Irish-American author and comedian. He is the older brother of Frank McCourt, author of the Pulitzer Prize-winning memoir *Angela's Ashes*. Malachy McCourt's own memoir, *A Monk Swimming*, is also very popular.
* Malachy McCourt Jr.: Malachy McCourt's son. He is a writer and a teacher, but he doesn't have the same public profile as his father.
Could you clarify what you mean by "Malachy McCourt Sr."? If you could provide more context, I might be able to help you further.