Stephen T. Baldacci is leaving the Herndon advertising agency White & Baldacci after a year and a half to start his own marketing company.

Baldacci, former president of business operations for the Washington Redskins football team, is president and vice chairman of the company, the largest independent advertising agency in the region.

Baldacci said in a statement he was still working out the details of his departure. He bought a minority stake in the company when he joined in December 2002.

The veteran marketing executive's name on the company's door last year helped the agency win a $200,000 assignment for the Virginia Baseball Stadium Authority, the state group trying to bring a major league baseball team to Northern Virginia. This year, the agency is working for the developers who want to build around a stadium. That contract expires at the end of August.

Chairman and chief executive Matthew C. White, son of the founder of the 40-year-old agency and its majority owner, will change the company's name to White & Partners and continue to focus on representing companies in the technology, travel and tourism business, a spokesman said. The agency says it has $60 million in annual billings and 50 employees.

Billings fell last year after the agency lost a $27 million Amtrak account it had held for 20 years. It laid off eight employees at its offices near Dulles Airport. The company says it has made up some of that lost revenue with new clients, especially the Department of Defense.

Baldacci declined to answer questions. But the agency spokesman said Baldacci left because he wanted to run his own marketing company, which will focus on sports and consumer products.

VIRGINIA

MCI, the big Ashburn-based long-distance company, and Telefonos de Mexico said Mexico's biggest phone company completed its acquisition of MCI's stake in Brazilian telecommunications company Embratel. Telmex agreed to pay $400 million cash for MCI's 19.26 percent economic interest and 51.79 percent voting interest in Embratel.

Orbital Sciences of Dulles said it installed its first orbital boost vehicle, which carries an interceptor designed to knock down hostile missiles, at a U.S. Missile Defense Agency underground silo at Fort Greely, Alaska. The company said it is on schedule to deliver up to 20 boosters by the end of next year.

Access National stock began trading on the Nasdaq National Market under the ticker ANCX. The Reston bank holding company said the listing would help it attract investors.

MARYLAND

MobilePro, a Bethesda wireless telecommunications company, agreed to acquire the long-distance customers of Herndon's Teligent. The deal will add $3 million in revenue. Terms were not disclosed.

Aether Systems, an Owings Mills wireless data company, agreed to sell its transportation division to an affiliate of Platinum Equity for $25 million in cash. The company also said it had received indications of interest regarding a sale of its remaining wireless business, the mobile government division, as it leaves high-tech to become an investor in mortgage-backed securities.

First Potomac Realty Trust, a Bethesda real estate investment trust that operates industrial buildings around the region, said it bought 14 buildings, primarily in the Maryland suburbs, for $123 million.

DISTRICT

The Washington Post Co. said it was increasing its daily distribution of the free commuter newspaper Express to 175,000 copies from 150,000. It is the second increase in distribution since the newspaper began almost a year ago.

Matthew C. White, left, and Stephen T. Baldacci of White & Baldacci. The advertising agency plans to change its name to White & Partners after Baldacci's departure.