The retailer conducted an extensive global search before appointing Fiddelke to succeed Cathy Smith.
The stock had risen 42% this year as the warehouse retailer benefited from strong consumer spending.
The "fast fashion" retailer said it would close stores in Canada, Europe, and Asia but continue operations in Mexico and Latin America.
The struggling retailer is expecting same-store sales and gross margin to start improving in the fourth quarter.
The toy maker is investing in its retail and digital businesses to "create a strong foundation from which to grow in the long term."
The luxury jeweler lost six selling days in its fourth-largest market during the second quarter because of pro-democracy protests.
The company plans to expand its platform to offer resale services to retailers, and recently announced partnerships with Macy’s and J.C. Penney.
Same-store sales improved in the second quarter but profit was hit by heavy markdowns to clear unsold merchandise.
The luxury department store chain has faced rising rents and unsuccessful attempts to find a buyer.
The retail and tech giant will expand its training programs to help employees move into more advanced roles.
The retailer is also closing a dozen more stores and could eventually "close up to 15% of our portfolio” of 967 stores.
The appointment marks Jonathan Ramsden's return to retailing after leaving Abercrombie & Fitch in 2016.
