The Town Center opened eight years ago on March 18, 2005.
Saldana was promoted to general manager at the Town Center in Boca Raton, a Simon property.
The moves were effective at the end of January.
"Angela brings with her more than 16 years of shopping center and commercial property management experience," said Brian Nelson, Southeast regional vice president for Simon Property Group, in a news release.
As general manager, she will manage day-to-day operations, maintenance and the budget, as well as tenant and community relations. She also will oversee the security and marketing of the center, said the release.
Crowder most recently was the mall manager of Virginia Center Commons, a Simon property near Richmond, Va. She also has experience as a retail sales and leasing associate with Taylor Long Properties and a property manager for GVA Advantis and Commonwealth Commercial Partners.
Crowder is from Richmond, Va., and started her industry career working for Faison and CBL while at SouthPark Mall in Colonial Heights, Virginia.
St. Johns Town Center draws more than 16 million visitors each year, said the news release.
It has more than 1.1 million square feet of shops and restaurants, including 11 anchor stores and more than 150 specialty stores.
In an October feature in the Daily Record, Saldana said he came to Jacksonville in 2004 for the construction of the Town Center.
The center was developed on 240 acres at the Interstate 295 East Beltway and Butler Boulevard.
St. Johns Town Center features the area's only Tiffany & Co., Louis Vuitton, Omega, Juicy Couture, Apple, Abercrombie & Fitch, The Cheesecake Factory, Maggiano's Little Italy, J. Alexander's, Coldwater Creek and White House Black Market, to name a few. Nordstrom is scheduled to open next year.
The center is co-owned by Ben Carter Properties and Simon Property Group, which also has ownership interests in The Avenues and Orange Park malls.
Simon Property Group Inc. appointed Angela Crowder as general manager of the St. Johns Town Center, succeeding Sal Saldana, who has been in the position since the Southside center was built.