Patient Reviews for Dr. Marsha Howerton-Engles in Tulsa, OK. Vitals.com DA: 14 PA: 35 MOZ Rank: 55. Marsha K Howerton-Engles - Posted on September 6th, 2016; Howerton takes the time to listen to my problems and concerns and discuss my treatment options and my expectations with me; She is an asset to my health care team; Her value to me far ....