I Have A Son Age 24, He Has Quit School,

I have a son age 24, he has quit school, he says he is sad and has been sad for a long time. He says everything has been expected of him and he is not happy. I want my son to talk to someone to help him where do I go first Professional Counselor, Psychologists, or Psychiatrists. I am not physicially near my son we are 800 miles away. I need to have him see someone. Who?