Mark S. Liberman, president and chief executive of the Los Angeles Tourism & Convention Board, announced Tuesday that he plans to retire by the end of the year.

Liberman has been with the board for nine years and was an executive with United Air Lines for 34 years. The tourism board represents Los Angeles to the meetings and convention industry and promotes the region to both individual travelers and event planners.

Liberman said he would work with the board’s executive committee to find a successor, and has been asked to stay on the board of directors after he retires. Chairman Tom Mullen, who is vice president of American Express, will lead the search committee.

“It is time to enjoy my other interests and activities….especially spending more time with my wife Karen and increasing my volunteer work with the Alzheimer’s Association,” Liberman said in a statement.