Mhairi trained at the Royal Scottish Academy of Music and Drama in Scotland, and went on to attain her masters in acrobatics, mime and clown at Jacques Le Coq, Paris. She has worked in theater, film and television throughout Europe. She formed her own theater company in Paris and worked extensively in clown. Moving to London, she ran an improvisation weekly night in the West End. Since moving to Los Angeles, she has performed stand up comedy throughout the city. She also performed with a sketch company at the Los Angeles Comedy festival.