I have been seeing Dr. Defren for a couple of years now. He is amazing. Such a great doctor, super intelligent, but caring, too. He really knows what those of us who suffer with severe lung disease go through every day. He does everything possible to improve our quality of life. I understand that he has another office in Beverly Hills. If you have lung issues, he is the doctor to see. I drive all the way from Acton to see him, and wouldn’t even consider changing to someone closer. He is worth the drive for me. He makes me feel safe, he helps me to understand how to make my life more bearable. I don’t have enough good things to say about Dr. Defren.