I want to find a lawyer to handle probate for my mother's estate

In 2012 my mother had a Will, Warranty Deed and POA made with the help of an attorney in her area. I tried calling his office and the number appears to be out of service. I think he may have retired or closed his office. How can I find that out or find his current contact info? What happens to an attorney's client records when they retire? Do you they get passed on to another attorney? If so how can I find out who has her records? (I'm assuming it will be easier for someone with my mother's records to handle probate than one for whom she is a new client.)