Martie Erwin, also known as Martie Seidel and Martie Maguire, (born October 12, 1969) is a country music songwriter, recording artist and musician, born and residing in Dallas. She is married to Irishman Gareth Maguire. For more details see  (http://www.dixiechicksfans.com/martie-gareth.html)
Martie is a founding member and leader of the Dixie Chicks. Her sister Emily Erwin is also part of the Dixie Chicks. The group has been performing since 1989.