Who is the Licensed Master Plumber?
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NYC Master Plumber License #1661
He is a person who has been tested by your city, town, or state.  The tests  ensure that the applicant has become an expert on the plumbing and gas codes serving that area.  Codes which protect your health and home's structural integrity.   
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Town of North Hempstead.

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Town of Babylon.                         

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License #'s posted on truck
He is not a handyman or person claiming to know how to do plumbing.  A lot of home owners are fooled by these imposters and pay the price.  It's a shame because when things don't turn out nicely they blame the "plumber".  The one who wasn't a plumber to begin with.  I'm constantly redoing these handyman jobs.  
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Company name and phone # clearly visible
The licensed master plumber is a tradesman who was first an apprentice, then a journeyman who accumulated years of hands on experience under the supervision of a master plumber.  New York City requires it's licensed plumbers to have seven years of plumbing experience before they qualify to be tested .
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         Town of Oyster Bay.

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Suffolk County.                             

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Town issued stickers.
New York City does a thorough background investigation which requires finger printing.  New York City is responsible for who they license and this protects you.  Insist on a Licensed Plumber to perform your plumbing and gas work.