Dr. Hannel began his educational career as a teacher of English and history at the secondary school level. After twenty years in the classroom, Dr. Hannel moved to school administration, serving as school principal and assistant superintendent. In 1987, Dr. Hannel was appointed Academic Dean and later Vice President for Academic Affairs at York College (NE). In 1990, Dr. Hannel relocated to LCU as associate professor of education and later as professor and Dean of Graduate Studies. After serving briefly as Dean of the College of Education, Dr. Hannel moved to Director of Graduate Education, where he served for 18 years.
After retiring in August 2015, he began adjunct teaching online courses for Graduate Education.