presiding arbitrator

基本解释

The third arbitrator shall be the presiding arbitrator.
第三名仲裁员是首席仲裁员。
lib.ncu.edu.cn
The Claimant and the Respondent shall jointly appoint or jointly entrust the Chairman to appoint a third arbitrator as the presiding arbitrator.
申请人和被申请人还应共同选定或者共同委托仲裁委员会主任指定第三名仲裁员担任首席仲裁员。
If an opinion of the majority arbitrators can not be constituted at the tribunal, the award shall be given according to the opinion of the presiding arbitrator.
仲裁庭不能形成多数意见时，裁决应当按照首席仲裁员的意见作出。

The arbitrator did the players no favor when he spoke out on other contracts (naming players specifically), which could taint the decision of any arbitrator who ended up presiding over hearings for guys like Luongo and Hossa, who are said to already be under investigation for their previously approved contracts.
FORBES: The NHL: Where No Contract Is Safe