The phrase "senior statesman" refers to a highly respected and experienced politician or public figure who is considered wise, knowledgeable, and influential in their field. Full definition
It was very interesting to watch his transition over the years from underling to senior statesman of Canadian legal publishing (albeit always with an outrageous remark at the ready and a twinkle in his eye). (slaw.ca)
Kevin Lipson was ranked as Senior Statesman for Nationwide, Energy: Oil & Gas (Regulatory & Litigation); Bruce Oakley was ranked in Band 4 for Texas, Litigation: General Commercial; and Jeff Whittle was ranked in Band 3 for Texas, Intellectual Property. (hoganlovells.com)
Mr. Olson is ranked among Chambers USA's Senior Statesmen in California litigation. (mto.com)