June 21 (Reuters) - Horizon Oil Ltd HZN.AX :
* MICHAEL SHERIDAN, WILL ASSUME ROLE OF CHIEF EXECUTIVE OFFICER
* MICHAEL SHERIDAN WILL REPLACE BRENT EMMETT AS CHIEF EXECUTIVE OFFICER AND AS A DIRECTOR OF COMPANY WITH EFFECT ON 1 JULY
* RICHARD BEAMENT WILL ASSUME ROLE OF CHIEF FINANCIAL OFFICER