In all the vast history of the sprawling bureaucracy known as the Port Authority of New York and New Jersey there has never been a job like it.

It came with no actual job description.

In the end, it had only one occupant, and he didn’t even have to submit a résumé.

Nobody seemed to have the vaguest idea what he was really doing.

But he was paid $15O,020.

The job of director of interstate capital projects, a special niche created for David Wildstein, the central figure in the George Washington Bridge scandal, has officially been abolished, the agency confirmed yesterday.

This means Wildstein will be forever known as the first and last DICP appointee.

A spokesman for the Port Authority, Chris Valens, did not say why the agency had eliminated the interstate capital projects directorship.

But some critics said that it was a fairly logical move.

"Maybe what it says is that his job wasn’t really necessary," said state Sen. Loretta Weinberg (D-Bergen).

The senator then added, sarcastically, "Maybe I’ll save a penny and half on my tolls next year." Weinberg co-chairs the special investigative panel looking into the lane closures.

It was August 2010, when the mysterious stranger walked into the agency’s Park Avenue headquarters in Manhattan.

Various sources there say he quickly dis-ingratiated himself by peering in, uninvited, on his new colleagues at their offices and, some say, minding everyone’s business but his own.

No one really seemed to know what that business was supposed to be doing. But whatever he was doing, he made it clear he did so at the behest of the governor.

Wildstein was hired by former Deputy Executive Director Bill Baroni, with the blessing of Gov. Chris Christie. Emails and other revelations now seem to indicate his job title may have been just a cover for serving the political interest of the governor.

"On many occasions I heard both he and Baroni say they have only one constituent: Chris Christie," said a former official, one of two who asked for anonymity because they did not want to jeopardize colleagues still at the agency.

The new director eventually became the subject of unwanted attention when he was identified by his boss, Baroni, as the agency official who ordered the now-infamous lane closures at the George Washington Bridge.

Wildstein resigned Dec. 6.

Wildstein’s credentials included a term as mayor of Livingston, where he had graduated from Livingston High School one year ahead of Christie, plus a stint helping run his family’s successful textile business. Before being hired by Baroni, he had founded the popular political blog, PolitickerNJ, where he wrote under the assumed name Wally Edge.

Baroni, who had been appointed by Christie, ended up resigning a week after Wildstein. The deputy executive director’s job was not eliminated, and instead Christie named Deborah Gramiccioni to replace Baroni.

Baroni and Wildstein are now among a group of 18 current or former officials affiliated with the Port Authority, the Christie administration and the governor’s re-election campaign who were subpoenaed by the Legislature.

Officials at the Port Authority say the title director of interstate capital projects may be gone from the organizational chart but it’s sort of legend now. And it won’t be soon forgotten.

"His thing was that he comes and stands at your door, and you finally invite him in, and he stands there and looks at you," said a former agency staffer, describing Wildstein, who, like Baroni, has declined to speak with reporters.

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