Ronald E. Curvin, co-chief executive officer at Marine Midland Capital Markets Corp., resigned on Friday, the company confirmed.

John Esau, director and manager of the firm's municipal underwriting department, will assume Mr. Curvin's position and title.

Mr. Curvin was unavailable for comment, and the company's spokesman offered no explanation for the resignation.

Mr. Curvin had been with Marine for six years. Formerly, he worked at Chemical Securities, where he was manager of the firm's municipal bond department. Mr. Curvin's family has been prominent in the municipal bond business, including his late father Winthrop, a banker at Smith Barney, Harris Upham & Co., and his brother Richard, a banker at First Boston Corp. Mr. Curvin himself has served in the Public Securities Association, and was instrumental in the creation of the municipal bond futures contact.

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