Callahan is Managing Director, International, at The Depository Trust & Clearing Corporation (DTCC).

Callahan is a well-known and respected executive in the international financial community. She has played a key role for DTCC and its subsidiaries over 25 years, serving on global committees focused on CSD activities, global standards, straight-through processing, and promoting cooperation among infrastructure organizations.

As President, Callahan will play a key role in advancing ACSDA's efforts to promote cooperation, information exchanges, best practices and cross-border relationships among central securities depositories and clearing houses from more than 25 nations across the Americas, as well as South Africa. Elected for a two-year term, Callahan succeeds Fernando Yáñez Gonzales, General Manager of Chile's Depósito Central de Valores S.A. (DCV).

"DTCC has made a significant contribution to ACSDA since its creation in 1999," said Yáñez. "We are delighted that Mary Ann is becoming the new president. She has strong knowledge of the markets comprising ACSDA, and will bring valuable experience and a global perspective to ACSDA."

"We're honored DTCC was selected to take on a leadership role at ACSDA, and we look forward to working closely with its members to further extend the growth and influence of this important association," said DTCC's President and CEO Donald F. Donahue who participated in ACSDA's Mexico City meeting hosted by S. D. Indeval S.A. de C.V., Mexico's national depository and clearing organization.

"I look forward to working with my colleagues to strengthen relationships among the depositories of the Americas," said Callahan. "ACSDA has an ambitious agenda for the next two years. We'll be sharpening our focus on corporate actions processing and standards, implementing a comprehensive communications strategy, and rolling out an ACSDA cross-training program to provide a more structured forum for the exchange of perspectives and innod innovative ideas. We're already gearing up for a week-long cross-training program in New York this autumn."

ACDSA regularly liaises with other industry organizations worldwide, including its counterparts in Asia, Europe, Africa and the Middle East and Eurasia; the International Securities Services Association (ISSA), the Association of Global Custodians and legal forums such as the Hague Securities Convention and UNIDROIT. Members of these groups will be coming together in Seoul, Korea next month for the 9th Conference of Central Securities Depositories (CSD9) to be held April 11-13, 2007.

Other ACSDA elections included Jorge H. Jaramillo, Chief Executive, Deceval, Colombia, as Vice President; Francis Stenning de Lavalle, CEO of Cavali, Peru, as Treasurer; Hector Anaya Doll, Chief Executive, S.D. Indeval, Mexico, as Working Committee chair; and Monica Singer, CEO of STRATE, South Africa, as Communications Committee chair. In addition, its Executive Committee members, Allan R. Cooper, President & Chief Executive Officer, The Canadian Depository for Securities Ltd; Amarilis Prado Sardenberg, Chief Operating Officer, CBLC, Brazil; Norberto Gysin, President, Caja de Valores, S.A., Argentina, Mariano Novoa Flores, President, CEDEVAL in El Salvador, and Fernando Yáñez Gonzales, General Manager of Chile's Depósito Central de Valores S.A.(DCV), were reelected.

More Background on Mary Ann Callahan:

Mary Ann Callahan is responsible for DTCC's international business relations and initiatives, as well as for coordinating global industry and policy issues within DTCC's senior management.

She has served in a variety of international business roles, including developing and managing DTCC's links with 16 other depositories. From 1998 to 2002, she served as head of DTCC's London representative office. She has also represented DTCC in developing Memoranda of Understanding for mutual exchanges of information with the China Government Securities Depository Trust & Clearing Co., Ltd., Japan Securities Depository Center, Inc., Korea Securities Depository, and the Taiwan Securities Central Depository Co., Ltd.

She represents DTCC in ISSA, and at CCP-12, the global central counterparty clearing group; on the Securities Industry and Financial Markets Association's Cross-Border Sub-Committee, and within the consultative committee for CSD9 and previously served on various subcommittees of the Group of Thirty.

She has an MBA in Finance from Stern Graduate Business School at New York University and a B.A. from Manhattanville College.