Calfrac Well Services Ltd. is announcing changes to its executive officers.  Effective December 17, 2021, George Armoyan has been appointed as the Company's interim Chief Executive Officer.  Mr. Armoyan joined the Company's board of directors in December 2020 and controls Calfrac's largest shareholder, G2S2 Capital Inc. In connection with such appointment, Ronald P. Mathison is stepping down as Executive Chairman, and has now been appointed as Chairman of Calfrac.  Mr. Mathison will continue his leadership of the Company's board of directors.  Calfrac provides specialized oilfield services to exploration and production companies designed to increase the production of hydrocarbons from wells drilled throughout western Canada, the United States, Argentina and Russia.