Communications Satellite Corp. (COMSAT) has announced a major realignment of senior executives at its principal division, COMSAT World Systems. Leading the list of appointees is William C. Taylor, former ITT Corp. executive director for U.S. Operations. He has been named senior vice president in charge of COMSAT's international communications services. Other appointments include: Lawrence M. DeVore, previously vice president for law and administration, to vice president for carrier and correspondent relations; Ellen Hoff, recently senior director of business planning for COMSAT's development office, to vice president for international operations; Harry Gross, who has been general manager of U.S. INTELSAT Earth Stations, to vice president for earth station services; John S. Hannon Jr., formerly vice president and general counsel of the COMSAT subsidiary, Satellite Television Corp., to vice president and general counsel of the world systems division; and Edward J. Martin, who recently served as vice president for international operations, to vice president for technology management.

At COMSAT General, the company's second-largest subsidiary, Elizabeth Young, president of the Public Service Satellite Consortium since 1979, has been elected vice president for marketing and business development. Don W. Flora, previously assistant vice president for marketing, has been named vice president for sales.

The Corporation for Public Broadcasting has appointed Donald E. Ledwig, a retired deputy commander for contracts in the U.S. Navy, to the post of treasurer and vice president for finance and administration.

Michele V. Ostrove, formerly an account executive with the Washington public relations firm of Ruder, Finn & Rotman, has launched Professional Writing Services, a new business specializing in public relations writing.

WDVM-TV, Channel 9, has named Jerry Grossman executive producer of Eyewitness News. Grossman, previously producer of the station's 6 p.m. news broadcast, has been replaced by Paul Malkie, who has returned after a stint as a producer at the CBS Washington news bureau.