Dr. Crabb was born and raised in Southeast Michigan. He was raised in a Christian home by his parents, Pastor George and Donna Crabb. He became a believer in the Lord Jesus when he was 13 years of age. He graduated from Christian school education in 1983 and pursued an undergraduate degree in Biology at Oakland University in Rochester, Michigan. During his undergraduate studies the Lord called him to preach. He immediately submitted to that call and started serving the Lord with his father who was the Senior Pastor of Antioch Baptist Church in Warren Michigan.

After finishing his undergraduate studies he was accepted in 1986 to Des Moines University "" College of Osteopathic Medicine and Surgery in Des Moines, Iowa. While obtaining his medical degree he continued to remain active in the local church in teaching and preaching the Bible. He obtained his medical degree in 1990 finishing number one in his class out of 185 students.

He returned to Michigan were he completed a one year internship program followed by a two and a half year residency in Internal Medicine at St. John Oakland Hospital. During the entire time of his training he never forgot about the call of God on his life to preach the truths of the Bible. Dr. Crabb found that God was designing a unique ministry were Dr. Crabb could use the medical field with all of its experiences and analogies in teaching and preaching the Bible and one day reaching the addicted.

After completing his training and becoming a Board Certified Internist, Dr. Crabb entered private practice in the Metro-Detroit area. For the next 14 years Dr. Crabb practiced medicine and assisted his father (and pastor) in the ministry. It was during this time that God lead him to have a specific interest in Addiction Medicine. Dr. Crabb took special courses to further his knowledge in this area of medicine including comprehensive courses that certified him by the Drug Enforcement Agency. This allowed him the ability to treat patients with a medicine called Suboxone. It was also during this time that God lead him to write his first book, "Just Say Know, God"s Answer to Addiction." (Published by Reformers Unanimous International)
During this same time Dr. Crabb and his father introduced a new ministry to Antioch Baptist Church called Reformers Unanimous International (RU). RU is a faith based addictions program which helps churches reach out to their communities in order to help the addicted and their families.

Through Reformers Unanimous coming to his church Dr. Crabb became acquainted with RU"s Founder and President Steven Curington. God wonderfully developed a friendship between these two men and they began working together to minister to the addicted across our nation and even our world. They continued their work together with Mr. Curington and the RU headquarters in Rockford Illinois and Dr. Crabb in Michigan. They soon found it was becoming more and more difficult to get projects done in a timely fashion. God then opened the way for Dr. Crabb and his family to locate to Rockord Illinois.

In June 2008 Dr. Crabb, his wife Linda of 23 years along with their three children moved to Rockford Illinois and became members of North Love Baptist Church under the pastoral leadership of Dr. Paul Kingsbury. Dr. Crabb now practices Internal Medicine and Addiction Medicine through the OSF-Medical Group in Rockford. He is a member of the American Society of Addiction Medicine and the American Osteopathic Academy of Addiction Medicine and the Christian Medical Dental Association. He continues to work very closely with RU as their Staff Physician and Medical Advisor. Dr. Crabb has authored numerous books on drug addiction, pornography and depression. Dr. Crabb actively travels putting on seminars and teaching and preaching from the Bible regarding the woes of addiction but more importantly the freedom an individual can have from their addiction through the Truth.