The Securities and Exchange Commission has asked John J. Mack , the chief executive of Morgan Stanley , to testify in its insider-trading investigation of a prominent hedge fund , reversing a decision that is at the center of several government inquiries into the agency 's handling of the case .
John J. Mack /business/person/company Morgan Stanley
DT NNPS CC NNP NNP VBZ VBN NNP NNP NNP , DT JJ NN IN NNP NNP , TO VB IN PRP$ NN NN IN DT JJ NN NN , VBG DT NN WDT VBZ IN DT NN IN JJ NN NNS IN DT NN POS NN IN DT NN .
John J. Mack
PERSON
Morgan Stanley
ORGANIZATION
/business/person/company