“J.P. Morgan Chase & Co.’s chief risk officer is taking a four-month leave of absence so he can spend time with his family, the latest upheaval at a bank long known for its unity and continuity.

“John Hogan intends to return, but there is also a chance he may not come back, said people close to him. He is “burned out,” said one person.

“Mr. Hogan, 46 years old, said in a memo to his employees that he will leave “later this month” and return to his role in “early summer.”

“”I’m looking forward to taking this time off to spend with my family and friends,” Mr. Hogan said in the internal memo. “I look forward to rejoining you all.” Mr. Hogan declined further comment.”

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