Creating the world's largest hotel company takes more than mastering rooms and rates—retaining a pair of leading Am Law 100 firms cozy with two travel industry titans can help seal the deal, expected to close by mid-2016.

On Monday, Marriott International announced that it had agreed to acquire Starwood Hotels and Resorts Worldwide in a $12.2 billion cash-and-stock transaction, one that if completed will unite two major operators of hotel brands and forge a dominant player in the hospitality and lodging sector, as noted by sibling publication GlobeSt.

Gibson, Dunn & Crutcher has taken the lead on the deal for Bethesda, Maryland-based Marriott, which controls the Courtyard, Residence Inn and Ritz-Carlton hotel chains. Stephen Glover, co-chair of the firm's M&A practice, is leading a team of lawyers from the firm working on the matter. Glover told The Am Law Daily in an interview Monday that Gibson Dunn's relationship with Marriott goes back a decade.