Marty Sklar, the man who supervised the design and construction of Tokyo Disneyland, the Disney-MGM Studios, Disneyland Paris and other theme park attractions, has died at his home, Disney said tonight. He was 83 and had made an appearance at Disney’s D23 two weeks ago.

Having started as an intern for Walt Disney, Sklar finished his 54-year career at Disney as the International Ambassador for Walt Disney Imagineering. That role meant traveling to art and design colleges and architecture schools to lecture and attract talent.

During his career, Sklar worked closely with Walt Disney and was instrumental in creating, enhancing and expanding Disney’s creative vision. Sklar was named a Disney Legend in 2001.

“Everything about Marty was legendary – his achievements, his spirit, his career,” said Bob Iger, Chairman and CEO of the Walt Disney Company. “He embodied the very best of Disney, from his bold originality to his joyful optimism and relentless drive for excellence. He was also a powerful connection to Walt himself. No one was more passionate about Disney than Marty and we’ll miss his enthusiasm, his grace, and his indomitable spirit.”

Born on February 6, 1934, in New Brunswick, NJ, Sklar was a student at UCLA and editor of its Daily Bruin newspaper when he was recruited to create The Disneyland News for Walt Disney’s new theme park in 1955. After graduating in 1956, he joined Disney full time and would go on to serve as Walt’s right-hand man — scripting speeches, marketing materials and creating a film showcasing Walt’s vision for Walt Disney World and Epcot, according to Disney.

During this period, he also joined WED Enterprises, the forerunner of Walt Disney Imagineering, and later would become the creative leader of Imagineering, leading the development of Disney theme parks and attractions for the next three decades. He retired as EVP and Imagineering Ambassador on July 17, 2009, Disneyland’s 54th birthday. Disney marked the occasion by paying tribute to Marty with the highest Parks and Resorts recognition, dedicating a window in his name on Disneyland’s City Hall.

“Marty left an indelible mark on Disney Parks around the globe and on all of the guests who make memories every day with us,” said Bob Chapek, Chairman of Walt Disney Parks and Resorts. “He was one of the few people that was fortunate to attend the opening of every single Disney park in the world, from Anaheim in 1955 to Shanghai just last year. We will dearly miss Marty’s passion, skill and imaginative spark that inspired generations of Cast, Crew and Imagineers.”

He also authored books about Disney including Dream It! Do It!: My Half-Century Creating Disney’s Magic Kingdoms (2013), and One Little Spark!: Mickey’s Ten Commandments and The Road to Imagineering (2015).

Skalr is survived by his wife of 60 years, Leah; son Howard and his wife, Katriina Koski-Sklar; grandchildren Gabriel and Hannah; daughter Leslie; and grandchildren Rachel and Jacob. In lieu of flowers, the family requests that donations be made in Marty’s name to Ryman Arts.