Colby Thomas was born in Huntington, New York. At
the  age of thirteen she  got  her  first  part  in a  high- school  production of
Plain and  Fancy in  which she played the character of  Ruth Winters. 
She later  studied   Singing  and  Drama  at  the New York  State  University  in  Oneonta.   While   studying there she performed in  such shows  as
Der kauka- sische   Kreidekreis by  Bertolt  Brecht,   Mame,  and The  Elephant  Man.
After  university  she  moved  to  NYC  and worked for several  Light  Opera  companies. She  sang  for  the NY Gilbert and Sullivan Players, where she played in many  of  their  operettas,  including  
The  Pirates  of Penzance, The Mikado,  and HMS Pinafore.  Notable for Phantom fans, Colby also sang with in the Opera Ensemble of New York's production  of A Little Night Music starring opposite Franc D'Ambrosio.
Her   regional   theater   and  touring  credits  include
Maria in
West Side Story,  Laurey in Oklahoma!,  and
most  notably,  Princess  Tuptim in the National Tour
The King and I  starring  Stacey Keach.  Her other credits  include  Luisa  in  The  Fantasticks, Tzeitel in Fiddler  on  the  Roof,   Countess  Olivia  in   Shakes- peare's  Twelth Night,  Puck in  A Midsummer Night's Dream,  and  Molly  in  Agatha  Christie's The Mouse-trap.
Colby was also very successful in singing solo parts
in  Händel's 
Messiah,  Mozart's  Mass in c-Minor with
the  Concert  Royal,  and  in Poulenc's
Gloria accom-
panied by the Catskill Symphony Orchestra.
Before  Ms.  Thomas  joined  the  production  of 
Phantom der Oper
in Hamburg in the spring of 1992
to  perform  as Princess  and  Christine Daaé under- study  firstly,  she  was  a  member  of  the  American
Musical  Company  and  toured  all over  Europe with
Oklahoma! playing the role of Laurey Williams. From January  1993  to  June  2001  she  was the principal Christine  Daaé  and   sang  it  in   more   than   1600 shows.
In the United States,  Colby is currently a  member of
Syracuse Vocal Ensemble.