Street veteran Bob Johnson recently joined Banc of America Securities' New York office to head up the firm's mortgage-related institutional sales and trading division. Formerly of Prudential Securities, Johnson brought along with him co-workers Ike Kearney and David Clifford from Prudential, as well as Betsy Comerford from the former DLJ. Until now, there were several vacancies left in BofA's mortgage staff, mainly because Chase Securities raided several senior members last year from BofA's New York and Charlotte offices. Among the former BofA employees scooped up by Chase were Kevin Blainey, Scott Auker and Gilio Michaud. Sources say a fourth senior executive went to Lehman Brothers. Johnson ran institutional sales and research for taxable fixed-income at Prudential.