Global financial services firm BTIG has named William Buchanan, Jr. as head of investment banking and Graham Powis as head of capital markets. Prior to joining BTIG, both worked at Lazard with Buchanan serving as CEO of capital markets and Powls working as head of U.S. equity capital markets. Also, the firm has promoted K.C. Stone to head of healthcare investment banking. Stone first came on board at BTIG as a managing director.