Rainbow Geffner has been seriously training for a professional career in the theater since she graduated from Sonoma State University in 1998. Destined she thought to work in San Francisco, her plans changed one afternoon when she met two actors from the south of Italy. Within an hour and a half they asked her to come and nanny their child and study theater with them in Italy. She said yes. Thus she was introduced to physical theatre at Teatro Kismet O.P.E.R.A. in a city called Bari in a region called Pulgia. While rehearsing a production of A Midsummer Night's Dream in which she was cast as Helena, she broke her knee and was flown back to the US to be operated on.

After her rehabilitation, not even out of the leg brace, she auditioned for and was accepted as a summer apprentice of A Traveling Jewish Theatre (ATJT) in San Francisco. After an eight week experience where she explored the techniques of Ann Bogart she had co-created her first ensemble theater piece, called The Golden Bird, based on a story with the same title written by Rabbi Nachtman of Bratzlav. The piece enjoyed so much success that it was included among ATJT's touring shows for the following year. The three actors proceeded to tour around the San Francisco Bay Area and the Midwest for the next year where The Golden Bird was met with great enthusiasm and appreciation.

A Traveling Jewish Theatre is an ensemble theatre company that focuses on creating original works, and is a member of an organization called (NET), Network of Ensemble Theatres. NET is a national organization committed to preserving and passing on the legacy of the ensemble theater movement. Working in an ensemble is based on trust, collaboration, and a commitment to discovering new ways of conveying emotions to an audience. Each participating theatre of NET brings a different approach and perspective to the work. Yet while all of the styles are unique it is typical for the ensemble process to result in work that is avant-guard and experimental in some way.

Rainbow graduated from Dell'Arte, International School of Physical Theater in 2001. Dell'Arte is an internationally renowned school that offers full-time training in physical theater, and the creation of original work and related skills. It is also a member of the NET. Dell'Arte draws on the traditions of Italian Commedia Dell'Arte, European masters such as Delsartre, Decroux, and LeCoq. At the same time the school offers a unique ensemble training by requiring the students to perform weekly with groups varying in size from two to eight. By the time Rainbow completed her nine month training at Dell'Arte she had performed in three student showcases, worked with Italian director Giulio Cessare Perrone in his adaptation of Milton's Paradise Lost, and toured for five weeks with fellow students with an original vaudeville show called Pantzablazin'.

At the end of her year at Dell'Arte Rainbow auditioned for another NET theatre called Touchstone Theatre which is located in Bethlehem, Pennsylvania. As one of four apprentices there, she co-created two original children's shows, one holiday show, produced her first solo performance and was involved in several other productions. Touchstone's approach to ensemble theatre focuses on using theatre as a community organizing tool, and as a teaching and healing device. To that end Rainbow had the opportunity to work in a middle school, assisting the director, in a student production of Romeo and Juliet.

Rainbow's own style has been influenced by her training at each of these theatres. Through these diverse experiences with various NET members Rainbow has seen that whether based on a script, a biblical text, an adaptation of a book, or community events and stories, ensemble theatre comes from a deep place in the performer, forcing them to work on self-exploration in order to do justice to the work, and produces profound and moving works that are remarkably creative and original.