Jeffers replaces Heather Maurer amid scrutiny of the council's Kalshi ties, with a permanent search set for January 2027.
The reshuffle covers 12 leadership positions across the South Korean casino operator's executive team.
According to both parties, the title sponsorship marks the beginning of a ‘multi-year relationship,’ set to feature additional experiences and activations launched across MGM Resorts properties.
Succeeding Erwin van Lambaart, Bierwirth will be one of only two people on the company's board.
John Boushy also served as SVP & Chief Integration Officer for Harrah’s Entertainment from July 2004 to January 2006, having worked with the operator for nearly 17 years.
Howk arrives from Inspire Entertainment Resort in South Korea, where he served as COO, and brings 30 years of gaming experience.
With almost a decade of experience in the company, the new VP will oversee the Hotel and Casino’s marketing strategies.
With 15 years of HR experience across a range of industries, Slámová will now oversee Allwyn’s people and culture departments in the Czech Republic.
The former Racing Queensland CEO will lead what is now Australia’s seventh-largest betting company.
Kelley’s appointment follows the resignation of former Jamul Casino Resort President & GM Mary Cheeks in August, having led the California gaming property for over eight years.