Richard L. Dineley III has been elected comptroller of Communications Satellite Corp., the corporation said last week. He will have responsibility for the accounting, financial and budgetary functions of the international telecommunications firm, which had sales last year of $442.3 million. Dineley joined the firm in 1981 as a senior financial analyst, after stints with Rockwell International and the American Enterprise Institute. Separately, Charles A. Zito, formerly with United Business Communications and Satellite Business Systems, was named vice president and division general manager of Comsat Technology Products, a manufacturing arm of Comsat.

NBC's Washington office has named James Boyle, formerly a legislative assistant for Rep. Frank R. Wolf (R-Va.), as publicist for "American Almanac," the network's new prime-time news show anchored by Roger Mudd. Also, Paula Mayer has been promoted to production associate for the show from production assistant. NBC White House correspondent Don Porter has left the Washington bureau to join KING-TV in Seattle as anchor/reporter. NBC has not replaced him yet, a spokeswoman said.

M/A-Com Information Systems Inc. has recruited Peter P. Kusek, a former senior executive for new business development at another M/A-Com affiliate, as executive vice president of the Rockville supplier of computer systems. Kusek and MISI President Carl English will head a new executive group to formulate strategies for the company's major segments: value-added distribution, federal government systems and management and third-party maintenance.

Nynex Corp., an offspring of American Telephone & Telegraph Co. that provides communications services in the Northeast, has appointed Irwin Litman executive director for legislative tax matters in its Washington office. Earlier in the summer, Thomas Lawrence joined the firm's Washington staff as director of federal regulatory accounting and finanical matters, and Susanne Guyer was named assistant director of federal regulatory matters.

Burson-Marsteller has appointed publicist James McAvoy a vice president in the international public relations firm's Washington office. A former political director for the National Republican Congressional Committee, McAvoy's accounts include the U.S. Committee for Energy Awareness and Morgan Stanley Inc.'s bid for Conrail. Also, Michelle Hartz, recently communications director for Life Technologies Inc., was named account supervisor.

Ad Design Ltd. of Warrenton, Va., has named Mary J. Tharpe president and a partner in the 2-year-old advertising and public relations firm owned by her husband, H. Moffette Tharpe. Tharpe had been executive vice president and treasurer of Adams Group Inc. and had managed her own communications firm for nine years before that. Ad Design also has recruited Margaret Berntson, an award-winning illustrator most recently with Warrenton Printing Co., as production manager and graphic artist.

The JN Co., a New York-based communications and marketing firm, has promoted Lester E. Blattner to vice president for sales in the Washington area. Blattner, who joined the firm last fall, formerly was president of his own communications consulting firm.