<Tr> <Th> Occupation </Th> <Td> Actress </Td> </Tr> <P> Katie Elizabeth Walder (born October 13, in Philadelphia, Pennsylvania) is an American actress . </P> <P> Walder is best known for her recurring roles on Gilmore Girls as Janet Billings, How I Met Your Mother as Shannon, and Mad Men as Sherry . She has appeared in over 40 television shows, including New Girl, Franklin & Bash, Fairly Legal, The Good Wife, Supernatural and Rules of Engagement . In 2007 she played Trevor Wright's girlfriend in the award - winning independent film Shelter . In 2014 she starred in the horror film Come Back to Me . </P> <P> Walder got her start in New York City, performing in stage roles with Broadway directors including Michael Greif, Keith Reddin and Daniel Aukin . She will soon be seen in the Paramount - owned comedy short Billy Glimmer opposite Ben Stiller . </P>

Who plays shannon on how i met your mother