Don Gawick, Houston-based C&J's current chief operating officer, will take the position of president and chief executive, in addition to performing his existing duties.
He replaces former chief financial officer Randy McMullen, who stepped in as chief executive after founder Josh Comstock died unexpectedly in March. McMullen was also serving as C&J's finance chief.
"Mr McMullen has also departed from his role as chief financial officer and as a member of the company's board," C&J said in a release on Wednesday.
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