In moves aimed at expanding their markets and increasing business, two Washington advertising and public relations agencies recently announced key executive changes.

Norman Goldberg was named chairman of the board and Carole Marchesano was promoted to president of Goldberg/Marchesano & Associates Inc. At Weitzman, Dym & Associates Inc., Diane S. Dym was named president. Former president Alan R. Weitzman continues as chairman of the board.

Goldberg/Marchesano is in the midst of a major expansion that will see its staff of 40 increased by 50 percent in the next six months to handle a corresponding growth in billings. Marchesano will be in charge of the agency's expansion efforts. The company currently has about $14 million in annual billings.

"We are anticipating growth in national business and regional business," Marchesano said. Some of the agency's local clients include The Washington Star, American Security Bank, Mutual Broadcasting System.

The agency recently received a Bank Advertising Award for best bank commercial for its 30-second American Security television spot. When Marchesano and Goldberg purchased the agency in 1970, it had three employes and $250,000 in billings.

"It's all coming together very nicely", said Diane Dym. "We've never had a better year." Now that she is president of Weitzman, Dym, Dym said she will be steering away from servicing individual accounts and will concentrate on new business and overall financial planning for the agency.

The agency, which is 10 years old, has annual billings of more than $10 million. Its list of accounts includes Family Fish House, Desk & Furnishings, the Capital Hilton, National Savings and Trust, Potomac Electric Power Co., Hazelton Laboratories and WDVM-TV. "Our philosophy is not to handle a grocery list of accounts," she said. "We keep our list relatively small, continually adding larger accounts and changing the list that way."

A native of New York City, Dym joined the agency in 1970 when there were two people and three accounts. She was named executive vice president in 1972 and became a partner in 1978. In 1976 Dym was honored as the Advertising Woman of the Year by the Advertising Club of Metropolitan Washington, the youngest woman to receive that award.