What makes a professional credible? The third speaker was a customer service expert (his name spelled correctly too) What makes a professional credible? Experience? Training? Accomplishments? Credentials? Results? Affiliation? Next Blog By jeff noel Retired Disney Institute Keynote Speaker and Prolific Blogger. Five daily, differently-themed personal blogs (about life's 5 big choices) on five interconnected sites. View all of jeff noel's posts.