Sales and sales management

Contact a professional who works with salespeople or conduct online research into the profession. This exercise can be done with physicians who have reps call on them, professors who have sales reps call on them, as well as professional purchasing agents. What do they think of salespeople and the value that these professionals get from their salespeople?
What separates the good salespeople from the ones that are not so good?

Make sure you support your initial post with credible research.

Must be APA guidelines. References, and good grammar, at least 100 words.