presiding       
adjective uk/prɪˈzaɪ.dɪŋ/ us/prɪˈzaɪ.dɪŋ/
 主持的,指挥的
in charge of a formal meeting, ceremony, or trial
  the presiding judge 审判长 
 The role of the presiding officer is to manage meetings. 主持人的职责是管理会议进程。 
 See: preside
 - More examples
 - The guitarist was, in fact, the presiding genius behind the band’s success.
 - They were married by the presiding justice of the peace.
 - Disturbed about what had happened, the presiding judge declared a mistrial.