| Originally hired as a writer for Laverne & Shirley. |
| Met Laverne & Shirley compadre David L. Lander (McKean played Lenny; Lander played Squiggy) at Carnegie Mellon University. |
| As a New York sessions musician in the late 1960s, recorded a single with the Left Banke. |
| With Lander, recorded the 1979 album Lenny and Squiggy Present Lenny and the Squigtones. |
| In 1994, became the oldest actor (at age 46) to join the cast of Saturday Night Live; other than Dan Aykroyd, he is the only person to be an SNL host, music guest and cast member. |