Chemical Venture Partners, New York, said John M.B. O'Connor had joined it as managing director of its mezzanine investment activities.

At the same time, the company said, Chemical Banking Corp., its sole limited partner, added $100 million in capital to the portfolio.

Mr. O'Connor headed global corporate research at Chemical Securities Inc.

McDonnell Information Systems said John E. Klein, a former senior executive with Digital Equipment Corp. and International Business Machines Corp., has been named president and chief executive of McDonnell Information Systems Americas.

He will be based in Lyndhurst, N.J.

In addition, Mr. Klein has been appointed to the board of directors of U.K.-based McDonnell Information Systems Group PLC.

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