He’s Bobby Troup. Bobby Troup was a composer; besides “Route 66” he composed the theme for The Girl Can’t Help It, performed by Little Richard.
You might also know Bobby Troup as Dr. Joe Early on the television show Emergency!.
He’s the guy in Robert Altman’s film MASH* who drives Hawkeye and Trapper around in Japan yelling, “Goddammed Army Jeep!”
I discovered all of this because in the span of one week, I discovered Emergency! is streamable on Netflix, and I rented The Girl Can’t Help It. That’s where I saw his name and did a bunch of research on IMDB and Wikipedia.
Emergency! is also available on hulu (at least the first 2 seasons are). For a while it was implied that Dr. Brackett and Nurse McCall had a relationship outside of work. I don’t know what she saw in him. Dr. Early was cuter and more stable.
Certainly in the early seasons there were scenes where Brackett and McCall were lounging after or before work at her apartment. I figure that implies things.