Robin Williams would have turned 75 on July 21, 2026. In honor of his dad’s big day, Zak Williams shared a photo of his dad from his Mork and Mindy days on Instagram along with a beautiful tribute. “Today I’m remembering your weirdness and your extraordinary capacity to love. I remember those wrinkles in the corners of your eyes, the kind you get from a lifetime of smiling. I remember your unending need to see this world free of human and animal suffering,” Zak Williams wrote. View this post on Instagram A post shared by Zachary Pym Williams (@zakpym) Zak Williams Invited Fans to Celebrate Robin Williams’ Birthday with Him Zak Williams wanted Robin Williams’ fans to share in the celebration of his dad’s birthday. He encouraged them to show kindness to others, just like his dad always tried to do.“For those out there who’d like to celebrate with me, go do something kind for someone. Make someone laugh. Put a little more good into the world. Love you forever,” he wrote. “Happy birthday Robin. We love you and miss you – you were the kindest, sweetest, and most brilliant man. I think of you all the time. I was so lucky to have you as a friend, “ a comment reads. Many agreed. Like this fan who wrote, “Your dad will be forever a guiding light for many… it was clear to many of us (his fans) that he was kind, caring, a genius, a man of great compassion and sensitivity and to be his son, you must carry much of that. So it warms my heart to know that those qualities still are alive and carry his name forward. Happy birthday to our dearest Robin.” Many planned to share in the celebration of Robin Williams’ birthday just the way Zak asked. “On it – this man was and always will be my absolute hero. I’m going to spend the day doing kind things for others in his honour,” a fan wrote. This story’s featured image is by Harry Langdon/Getty Images