She started her acting career on Broadway performing in "Hair". Van Valkenburgh also appeared in Off-Broadway plays, including Honeybee, The Tempest, Six Characters in Search of an Author, Hay Fever, When Did You last See Your Mother?, Iolanthe, It Ain't Aardvark, and Minutemen.
Besides acting in many New York plays, she has acted in regional and touring company productions of Mooney's Kid Don't Cry, The Children's Hour, and A View From the Bridge. Van Valkenburgh has studied acting with William Esper and John Shea, ballet with Ballet Arts Carnegie Hall and modern dance with James Cunningham. She also studied puppet production with Jim Henson, voice with Kirk Nurock and Richard Green, and improvisation with Dan Richter.[6]