Getting Mark's signature for documents
Email Mark only, including in the subject line "sign0mg" and include the document and a brief explanation so that he can review it. Ask in the email if Lori can use his electronic signature or sign on his behalf. Then write to Lori requesting his signature once you have it authorized, and include Mark's email.
Lori's hours are posted on the wiki calendar. http://info.gersteinlab.org/Calendar