Doormen are an essential part of our lives. When you're running late for that mani/pedi, you shouldn't be expected to push, pull or revolve anything.

But what you may not realize is that these employees of the entrance and exit Industry aren't always born with the innate skill to kindly greet or depart their guests -- some go to school for it.

The Doorman School at The Waldorf-Astoria New York is the Harvard of doorman institutions (The one at the Holiday Inn on Canal Street is a good safety school). Run by Michael Romei, a 16-year veteran of the prestigious hotel, students are taught the essentials of the trade. They go through countless role-playing exercises and watch instructional videos during the day-long seminars.

"Giving good service is a feeling that can be as addictive as eating a piece of chocolate or drinking a fine wine." Romei tells The New York Post. He'll even randomly check in on old students, just to see if his lessons have stuck.

Asylum had a chance to catch up with Romei and ask him about the top five essentials to being a great doorman. However, this does not entitle you to put his school on your resume. Keep reading for Romei's tips of the trade.

You'll never make it in this business with your head down at the door and a sour puss on your face. Always greet your customers with a grin. "This will create a sense of being approachable and attentive to your tenant's needs, as well as diffuse any problem situation," Romei tells Asylum -- like someone changing their dinner reservation from a party of three to a party of four.

Too often, you'll find a rogue doorman, three-days unshaven, trying to pass off last season's sport coat as acceptable attire. No thank you, sir. "It's highly important that you care about your grooming," says Romei. "A conservative, charcoal gray suit that looks good on almost anyone is the ideal uniform." Make it a three-piece and you're already ahead of the game.

No slang, no ass slaps. You need to be professional with your greetings. Romei recommends, "Good morning, "Good afternoon," "Good evening" or "How may I help you?" Of course, there will always be the young maverick trying to pass off a "How ya doing?" at the door. It's only a matter of time before he gets sent down to some B&B in Poughkeepsie for the morning shift.

It doesn't matter whether you're suffering from stage-three scoliosis or you've got a cracked vertebrae, when you're on call, posture is key. "When walking, walk briskly. Leave your right hand free in order to make impromptu introductions." says Romei. We've seen guys caught off-guard by an intro, sticking their left hand out for a shake like some rookie at the Red Roof Inn.

Door watch is a team game. Between the bellhops and the valet, you've got a cutthroat hospitality crew on your hands. Stay cool. "You want to present a professional and inviting picture to your tenants and visitors!" reminds Romei. So when tensions run high, and the Henderson family arrives for a three-night stay and a whole slew of sites to see, you better not lose it.