Dr. Diehn was born and raised in Baltimore and received his medical degree from the University of Maryland in Baltimore. He trained at the Union Memorial Hospital and completed his residency in Otolaryngology at Johns Hopkins. He is board certified and a Clinical Associate Professor of Otolaryngology at Johns Hopkins. He has been recognized as one of the "Best Doctors in America" and a "Top Doc" in Baltimore magazine on several occasions. He enjoys taking care of children and treating general problems of the ears, nose and throat.