Born in the English city of Birmingham, Moore moved to the United States for training as a junior.

Making her WTA Tour debut as a 15 year old at the 1991 Virginia Slims of Philadelphia, she went on to reach a best ranking of 252 in singles and 179 in doubles.

Subsequently known as Joanne Wallen, she has worked as a coach for the United States Tennis Association (USTA).

She currently works as the Senior Director of the USTA National Campus in Orlando, FL.

Since 2016 she has served as the Director of Adult Individual Play and Wheelchair Tennis.