 In the season nine premiere , interns Dr. Jo Wilson ( Camilla Luddington ) , Dr. Heather Brooks ( Tina Majorino ) , Dr. Shane Ross ( Gaius Charles ) , Dr. Stephanie Edwards ( Jerrika Hinton ) , and Dr. Leah Murphy ( Tessa Ferrer ) are introduced . Steven Culp and William Daniels play Dr. Parker and Dr. Craig Thomas , respectively . Dr. Parker is Chief of Cardiothoracic Surgery and Dr. Craig Thomas ( William Daniels ) is an attending cardiothoracic surgeon at Mayo Clinic , where Cristina worked temporarily . Dr. Alana Cahill ( Constance Zimmer ) introduced in the ninth season is appointed to cut costs at the hospital and she eventually decides the best course of action would be to seek out a new buyer until the four crash survivors and Torres on the behalf of Sloan to pool their money together in a bid to purchase the hospital themselves . Kepner starts dating a paramedic named Matthew ( Justin Bruening ) and they form a deep relationship over the course of the ninth ad tenth seasons and she eventually agreed to marry before reconciling with Avery in the middle of the wedding Mathew . Lauren Boswell ( Hilarie Burton ) is introduced as a craniofacial surgeon consulting on a case at Grey Sloan Memorial who showed romantic interested in Arizona and eventually ended up having a one @-@ night stand with her . 
