Bringing You High Quality Care You Can Count On. The practice of Cullen, Umosella, Cullen, and Cullen has been serving the DC area since 1955. Our emphasis is on the doctor-patient relationship and its importance in successful patient care. Make an appointment with us today. Schedule a virtual visit Make an appointment.About Us‧Services‧Contact Us‧Virtual Visit‧Dr. Dennis Cullen‧Dr. Charles Umosella.