Doctor of the Church is a title conferred on about 35 saints who distinguished themselves through the orthodoxy of their theological teaching.
As of 2015 there are 36 Doctors of the Church. For a complete list, click this link.
There are about 3 dozen Doctors of the Church and all of them are saints. You need to be more specific.
Both Teresa of Avila and Catherine of Siena were declared Doctors of the Church in 1970.
Saints are named Doctors Of The Church when the Church and its people have benefited from their writings. Some defended The Church against herisies, and others have left writings that show a way to live your life for God. There are a number of reasons why they could be named a Doctor of The Church.
Ambrose
Yes! A large number of the doctors in Utah are not members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church). Both of my doctors, my husband's doctor, and my son's pediatrician are not Mormons, and their offices are located in the suburbs of Salt Lake City.
Both Teresa of Avila and Catherine of Siena were declared Doctors of the Church in 1970.
There are three female doctors of the Church: St. Catherine of Siena, St. Teresa of Avila and St. Therese of Lisieux.
It is not clear to me that the church would necessarily be the center of a medical doctor's life. It is not a requirement of the job!. However for any person that is religious, the church would be central to their life.
St. Ambrose
Actually, only a small percentage of saints have been declared Doctors of the Church. For a list see the link below.
St. Teresa of Avila was declared a Doctor of the Church in 1970.