Latham & Watkins LLP, the country’s highest-grossing law firm, said Tuesday that its chairman, William Voge, is relinquishing his position and retiring from the firm after engaging in sexual communications with a woman unaffiliated with Latham.

Latham’s executive committee said the resignation follows a series of voluntary disclosures by Mr. Voge related to “the exchange of communications of a sexual nature with a woman whom he has never met in person and who had no connection to the firm.”

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