Home Locations OB/GYN Associates of Sewickley – Sewickley OB/GYN Associates of Sewickley – Sewickley OB/GYN Associates of Sewickley – Sewickley 720 Blackburn Road, Sewickley, PA, USA Ioanna Kannellitsas, MD Rebecca Welch, MD Wenjun Zong, MD, PhD Practice Information