Lamb began training with Madame Tatiana Legat, at the Boston Ballet School aged 13.

She was awarded a gold medal in 1998 by U.S. President Bill Clinton after being named a Presidential Scholar in the Arts.

[6] Lamb's repertory includes the roles of: Sylphide (La Sylphide), Marie Larisch (Mayerling), Tatiana and Olga (Onegin), Thaïs pas de deux, Masha (Winter Dreams), Voluntaries, Polyphonia, The Grey Area, Afternoon of a Faun, Chroma, Infra, Tanglewood, Sylvia, Stop Time Rag Girl (Elite Syncopations), white girl and blue girl (Les Patineurs), Fin du Jour, Alice (Alice's Adventures in Wonderland), Princess Belle Rose (The Prince of the Pagodas) and Human Seasons, Manon (L'histoire de Manon).

Her father and mother, John and Kathleen Lamb, ran the camp for many summers after Helen retired.

[9] Sarah Lamb married fellow dancer, California-born Patrick Thornberry, in 2005, and they reside in London.