Authoritative: Show why you're an expert

Showing your credibility is essential.

• To help you not to come off as arrogant, write in the third person. "He is" instead of "I am."
• Focus on achievements, not titles, degrees, or years of experience. 
• Use concrete facts, not vague terms like "expert" or "industry leader." This can be done by showing the results you've gotten for customers, putting the spotlight on them while revealing your expertise.
• It's better to focus on subject matter expertise rather than your credentials.