Dr. Nak O. Nortey, 70, of Lancaster, entered into rest on Thursday, October 15, 2015 at home. Born in Ghana, West Africa, he was the son of the late Okwei Mensah and Regina Martei. Nak was the loving husband of Carol Nortey. Dr. Nortey came to the United States over 40 years ago to further his education and earned his BS, MS, and PhD in Mechanical Engineering. He holds five patents in mechanical machinery, a remarkable achievement. He was employed by ACI Services, Inc. where he designed compressor products for mechanical and industrial engineering. Dr. Nortey was the founder of the United African Association, to bring Africans together to develop Africa so that they can become self-sufficient. Nak loved his family and enjoyed teaching others. In his spare time, he enjoyed playing the stock market. In addition to his wife, Carol, Nak is survived by four children: Crystal Gallagher of Dover, PA; Sherri Bostic of York, PA; Mensah Nortey of Lancaster, PA; and Kai Sowell of Birmingham, AL. He is also survived by four grandchildren: Sarah, Deja, Vaughn, and Chance. A funeral service to honor Nak's life will be held at 2PM, Tuesday, October 20, 2015, at the Charles F. Snyder Jr. Funeral Home & Crematory, 3110 Lititz Pike, Lititz, PA 17543. Family and friends will be received at the funeral home from 1 to 2PM, prior to the service. Interment will follow at Landis Valley Cemetery.