When I was a McKinsey consultant, I worked with a client who once said, “You’re the most professional consultant I’ve worked with.” What he meant wasn’t about being formal or wearing a suit—it was about how I showed up, how I communicated, and how I made his life easier.

If you’re preparing for consulting interviews, or if you’re in industry and want to work with top-tier people, professionalism is a key differentiator.

What Does It Mean to Be Professional?

Professionalism means:

  • You show up on time.
  • You deliver what you promise.
  • You ask good questions—and actually listen to the answers.
  • You prepare ahead of time so others don’t have to bring you up to speed.
  • You don’t make excuses.
  • You don’t waste people’s time.

Professionalism also means:

  • You communicate clearly and concisely.
  • You write structured emails.
  • You’re respectful—especially when you disagree.
  • You dress appropriately for the setting.
  • You don’t overpromise. And you don’t underdeliver.

Why It Matters in Consulting

In consulting, time is expensive. When you’re on a team, everyone expects that you will get your work done—without needing hand-holding. When you meet with clients, your role is to inspire confidence. When you interview, your interviewer is asking, “Can I trust this person in front of my client next week?”

Every interaction is a test.

Being professional increases trust. It reduces friction. It makes people want to work with you again.

How to Practice Professionalism Before You’re Hired

Even if you’re still in school or early in your career, you can demonstrate professionalism:

  • Show up to case practice calls on time.
  • Send a thank-you message after someone helps you.
  • Follow through when you say you’ll do something.
  • Format your resume neatly and concisely.
  • Be concise in your emails.
  • Treat everyone with respect—even peers and juniors.

Final Thoughts

Being professional isn’t about being stiff or impersonal. It’s about showing up in a way that makes other people’s lives easier.

That’s a superpower in consulting—and in life.