Which major law firms employ a Chief Client Service Officer, Director or equivalent?

Which major law firms employ a Chief Client Service Officer, Director or equivalent? Some law firms that employ a CCSO or equivalent: Baker McKenzie, Ballard Spahr, Blank Rome, BLG, Dentons, DLA Piper, Goldsberg Segalla, Hogan Lovells, Husch Blackwell, Linklaters, MinterEllison, Morgan Lewis, Norton Rose Fulbright, Ogletree Deakins, Oslers, Peckar & Abramson, Pepper Hamilton, Pillsbury, Proskauer, Smith Anderson, Steptoe & Johnson, Stoel Rives, Wilmer Hale, Winston & Strawn, and Womble.