Major League Baseball continued restructuring its baseball operations department on Tuesday, annoucing several key appointments.

Kim Ng and Peter Woodfork joined MLB as senior vice presidents for baseball operations, serving under Joe Torre, recently named executive vice president for baseball operations. "We are very pleased to add talented executives in Kim and Peter, both of whom have extensive experience at the club and league levels," Commissioner Bud Selig said in a written statement on Tuesday. "Kim and Peter have bright futures ahead of them, and we are very happy that they will be working with Joe."

Ng and Woodfork, former assistant general managers with the Dodgers and D-backs, respectively, both bring strong leadership resumes into their new roles.

Ng, one of three females to hold an assistant GM position with a club, spent nine years with the Dodgers after holding the same position with the Yankees from 1998-2001. She also served as the director of waivers and records for the office of the American League.

Woodfork returns to work at MLB, where he began his baseball career working in the labor relations department. With Arizona, he managed the club's roster and worked on contract negotiations, scouting and Minor League development. Before that, he served as director of baseball operations and assistant director of player development for the Red Sox from 2003-05.

"Kim and Peter will play key roles as we shape our department and serve all the clubs of Major League Baseball," Torre said in the announcement. "I have known Kim for many years, and Peter is very familiar with much of the staff at MLB. I am looking forward to working with them."

Selig also announced corresponding moves in the department on Tuesday. Joe Garagiola, Jr., who had worked as the senior vice president of baseball operations since 2005, will now serve as the league's senior VP of standards and on-field operations. Garagiola, who will also report to Torre, will handle issues such as discipline for on-field infractions, pace-of-game matters, uniform policy and other on-field issues.

"Joe Garagiola, Jr. is an accomplished executive, and with his experience as a general manager and his relationships throughout the game, I believe he is well-suited to address on-field issues," Torre said."

In addition, two of MLB's umpire supervisors, Randy Marsh and Rich Rieker, were promoted to the positions of directors of umpiring.

Marsh's resume includes more than 40 years of professional umpiring experience, including five World Series. He was appointed an umpire supervisor prior to last season.

Rieker, a former umpire and league liason to the umpires since 2002, has been part of the umpiring department's outreach and educational efforts, including orchestrating the now annual MLB Umpire Camps.

"I am eager to work with Randy Marsh and Rich Rieker, both of whom have considerable on-field experience," Torre said. "I have a great deal of respect for our umpires, and Randy, Rich and our supervisors will be our eyes and ears with the staff. ... Collectively, our goals are to protect the integrity of the game and to make the game better for the clubs, on-field personnel, and the fans of baseball."

On Monday, MLB reportedly cut ties with executives Darryl Hamilton, Mike Port, and Ed Burns. Hamilton was an assistant to Selig since late 2006. Port was the league's VP of umpiring and Burns was VP of operations and administration.