WASHINGTON >> The departure of Scott Pruitt, the scandal-plagued former head of the Environmental Protection Agency, means the agency will be led in the coming months by Pruitt’s deputy, Andrew Wheeler, a former coal lobbyist who shares Pruitt’s zeal to undo environmental regulations.

But unlike Pruitt — who had come to Washington as an outsider and aspiring politician, only to get caught up in a swirl of controversy over his costly first-class travel and security spending — Wheeler is viewed as a consummate Washington insider who avoids the limelight and has spent years effectively navigating the rules. For that reason, Wheeler’s friends and critics alike say, he could ultimately prove to be more effective than his controversial former boss in implementing President Donald Trump’s deregulatory agenda.

On Thursday afternoon, Trump tweeted that he had accepted Pruitt’s resignation and that Wheeler would take over as acting director of the agency.

Wheeler is expected to serve in an acting capacity as head of the EPA until Trump nominates a new agency chief, who must then be confirmed by the Senate. That process could take months and potentially stretch past the November midterm elections.

It is possible Trump could nominate Wheeler to the top job. However, several other names have also been mentioned as possible successors to Pruitt, including Donald Van der Vaart, a former senior environmental official in North Carolina. Pruitt selected him to serve on an EPA scientific advisory board.

In a June interview with the Washington Examiner, Wheeler said he had no interest in taking over his boss’s job. “I could have put my hat in the ring for the administrator. I wasn’t interested in that. I am still not interested in that,” he said.

Wheeler will now step in as the acting chief of an agency that has been central to Trump’s signature campaign promise of stripping away regulations.

During Pruitt’s tenure, the former Oklahoma attorney general gained headlines for his aggressive push to roll back dozens of regulations governing clean air and water, and fighting against Obama-era rules focused on limiting carbon emissions. In recent months, however, Pruitt’s policy efforts were overshadowed by a running stream of alleged ethics violations.

Pruitt is the subject of at least 13 federal investigations, and a government watchdog agency earlier this year concluded he had broken the law with his purchase of a $43,000 secure telephone booth for his office. He is also under investigation for his 2017 $50-a-night lease of a condominium from the wife of a powerful Washington lobbyist, and for accusations he demoted or sidelined EPA employees who questioned his actions.

The allegations and investigations came as Pruitt appeared to be using his job in the Trump administration to position himself for an eventual run at political office, perhaps as senator or governor in Oklahoma with an eventual eye on the presidency. At the same time, many of Pruitt’s policy initiatives have stumbled because of haste or imprecision. At least six have been struck down by the courts.

By contrast, Wheeler tends to eschew the limelight, his colleagues said. His career was built around quietly and incrementally advancing the interests of the fossil-fuel industry, chiefly by weakening or delaying federal regulations.

Wheeler has worked in Washington for more than 20 years. He is a former chief of staff to Sen. James Inhofe, R-Okla., who has become known as Washington’s most prominent denialist of the established science of human-caused climate change. Wheeler also worked at the EPA during the administration of President George H.W. Bush. More recently, he lobbied for the coal company Murray Energy, whose chief executive, Robert E. Murray, has been a supporter and adviser of Trump’s.

Environmentalists see in Wheeler a powerful ally of polluting industries and enemy of clean air and water. “Like Pruitt, this veteran coal lobby lobbyist has shown only disdain for the EPA’s vital mission to protect Americans’ health and our environment,” said Ana Unruh Cohen, managing director for government affairs at the Natural Resources Defense Council, an advocacy group.

Wheeler has appeared to embrace criticism from the left that he is an ally of fossil fuels, according to email exchanges obtained by the Sierra Club under a Freedom of Information Act request. In October, soon after Wheeler was nominated to his position as deputy director, he sent an email to Pruitt’s chief of staff, Ryan Jackson, a longtime friend, with a headline from The Onion, the satirical publication: “EPA Promotes Pulsating Black Sludge to Deputy Director.”

“Welcome, pulsating black sludge,” Jackson responded. “I guess I’m going to have to get the cleaning crews to come in more often.”

Washington insiders describe Wheeler as well positioned to pursue Trump’s agenda as effectively as Pruitt, or even more so, by moving more slowly but in ways likelier to withstand legal challenge. “Andrew is one of the most well-known, well-respected policy professionals in Washington on energy and environment — he knows everybody,” said Matthew Dempsey, a former colleague of Wheeler’s in Inhofe’s office, who works for a lobbying firm representing the oil and gas industry.

“He will be similar to Pruitt in terms of the agenda — he understands the Trump administration and will carry out the agenda,” Dempsey said. “But he’s been around Washington a long time. He knows how D.C. works and he does things by the book.”

The departure of Pruitt, a former protégé of Inhofe’s, and rise of Wheeler represents the powerful influence of Inhofe on the Trump administration’s environment policy. Inhofe had long championed Pruitt’s political career, and it was speculated that Pruitt would one day run for Inhofe’s Senate seat in Oklahoma.

Wheeler is one of a group of former Inhofe staff members, loosely known as the “Inhofe mafia,” who now work in energy and environment policy positions across the Trump administration and in top Washington lobbying firms.

Inhofe cheered Wheeler’s arrival at the EPA earlier this year. “Andy Wheeler is the most competent and qualified person for the job he’s been asked to fulfill,” Inhofe said.

Wheeler’s rise also represents a victory of influence for another of his former bosses, the coal magnate and Trump adviser Robert Murray.

A few weeks after Trump’s inauguration, Murray, who contributed $300,000 to Trump’s inauguration fund, presented the president with a wish list of regulations he wanted to see lifted from the coal industry. In particular, Murray has pushed Trump to undo President Barack Obama’s regulations designed to curb planet-warming pollution from coal-fired power plants, a leading cause of global warming. Trump then assigned Pruitt to roll back those rules.

Like Trump, Inhofe and Pruitt, Wheeler has questioned the established science of human-caused climate change. In 2010, Wheeler criticized the United Nations Intergovernmental Panel on Climate Change, the world’s leading scientific authority on global warming, writing in a blog post that it has “has functioned more as a political body than a scientific body.”

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