When Blackstone Group LP's top executives learned last week that they were losing their longtime chief financial officer, they eschewed a lengthy search and went with one of their most-tenured deal makers.

The world's largest private-equity firm said last week that Michael Chae would become its finance chief next month when Laurence Tosi, Blackstone's CFO since 2008, leaves for the same role at Airbnb Inc.

Leaders at Blackstone, which manages roughly $333 billion on behalf of pensions, endowments and wealthy individuals, decided the company's CFO should be someone who could potentially run the firm, and that anyone in that position must have an investing background, according to people familiar with the hire.

In Mr. Chae, 46 years old, the firm chose one of its most experienced deal makers and trouble shooters. He joined Blackstone in 1997, before the global firm—housed then in a single Manhattan office—even disclosed its assets under management.

Becoming CFO "represents a natural progression" of his career at Blackstone, Mr. Chae said in an interview Monday. "Having worked across our businesses and regions as an investor, to be able to bring that experience and knowledge to driving the operations of the firm as a whole is an exciting opportunity," he said.

Mr. Chae played a central role in some of the firm's largest and most lucrative private-equity investments, including those involving arts-and-crafts retailer Michaels Companies Inc., hotelier Hilton Worldwide Holdings Inc. and television-ratings firm Nielsen NV.

"His investing background is an extremely helpful element to his credibility as a CFO," said John Waldron, co-head of investment banking at Goldman Sachs Group Inc., a former classmate of Mr. Chae's at the Lawrenceville School, an elite New Jersey high school. "The combination of being well-liked externally and credible internally makes him a great choice."

In 2010 the firm dispatched Mr. Chae to Hong Kong to straighten out its then-sputtering business in Asia. He returned to New York last year to resume his role spearheading private-equity deals in media and telecommunications while retaining oversight of Blackstone's Asia business.

Currently he is involved with a relatively new group within the firm that has a broad mandate to invest in niches that don't fit its other business lines and is shepherding the spinout of the firm's corporate advisory unit into a separate public company.

"He's a broad guy; he's seen a lot," said David Calhoun, who was recruited by Mr. Chae to be CEO of Nielsen, after Blackstone bought the company, and who joined Blackstone early last year as senior managing director and works with the companies in which the firm invests. "I can't imagine a technical aspect of our CFO role that he can't master."

Mr. Tosi is credited with leaving behind a "best in class" finance operation at Blackstone, making for a smooth transition to Mr. Chae, said Michael Kim, an analyst with Sandler O'Neill + Partners LP. Mr. Kim points to the seamless CFO swap last year at rival Carlyle Group LP, which promoted insider Curtis Buser to replace Adena Friedman, who rejoined Nasdaq OMX Group Inc. after three years at the private-equity firm.

"While it's always difficult to see a highly capable professional depart, we expect it will be business as usual for Blackstone," Sanford C. Bernstein analyst Luke Montgomery wrote in a note to clients.

Vipal Monga contributed to this article.

Write to Ryan Dezember at ryan.dezember@wsj.com

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