Maryland Code, State Government § 2-1605

(i) the chair of the investigating committee;

(ii) if the chair is absent or otherwise unable to preside, the vice chair; or

(iii) if the chair and vice chair are absent or otherwise unable to preside, the individual who is selected under the rules of the investigating committee.

(i) shall examine the witnesses or supervise the examination by any other member of the investigating committee or by staff who are authorized to examine witnesses; and

(ii) may direct a witness to answer a relevant question or to provide a relevant book, document, or paper.