Longtime Hallmark star and new “Sullivan’s Crossing” cast member Marcus Rosner has found his best role yet: dad.
Rosner and his wife, filmmaker Ali Koeker, announced the arrival of their first child on February 1, 2026. Four months into parenthood, Rosner is feeling so good about being a present and doting dad to their baby boy after growing up without his own dad.
Marcus Rosner’s Wife Says Their Baby Boy is the ‘Luckiest’
Currently on a family trip to Greece, Rosner shared the sweetest photo on May 22 of himself squatting on the beach and holding his little guy, dressed only in a onesie, to stand up in the sand. In the caption, Rosner wrote, “I was so scared the absence from my own childhood left me unprepared. I was so wrong. I’m [expletive] great at this.”
In the comment section, his wife sweetly wrote of their son, “He’s the luckiest boy 🩵”
Many fans chimed in, too, including one who commented, “Enjoy every moment, they are so magical. Kids grow up so fast❤️”
Another wrote, “Love seeing photos and videos with you and your little guy. You are an amazing dad You are in such a magical place. Greece is beautiful. Enjoy your time there and stay safe ❤️❤️❤️”
“Your mom and family gave you plenty of love and guidance,” someone else shared. “They taught you well and you will do the same with your son. They gave you the tools to be a good parent. With God leading the way you will be just fine.”
Marcus Rosner Has Shared How Emotional New Fatherhood Has Made Him
Rosner has been open about the fact his mom, Christine, bravely raised him after giving birth at 15, and released a short film called “Emergency” in early 2026, inspired by his childhood. The 14-minute film won its first award, “Programmer’s Choice Best Short Film,” at the Sedona Film Festival.
In March, Rosner shared a post that revealed how meaningful his first weeks of fatherhood had been. With text over a close-up photo of him gazing at his son, grasping his finger, Rosner wrote a lengthy, run-on sentence that encapsulated his awe over all the emotions and thoughts flooding his head and heart.
“The damn feeling just grows and grows and grows,” Rosner began, “and then they kinda wake up after a few weeks and look at you — like REALLY look at you and it’s game over and then they smile for the first time and you want to punch a hole in the wall because you have so much [expletive] feeling bursting through you that you don’t know how to process…”
Rosner noted that his wide range of emotions make him feel like “you’re just going to explode and you cry all the time and you’re afraid they’re gonna figure out how to walk and go out in the world and someone is gonna be mean to them and then you’ll have to kill someone and you’ll have to spend your life in jail and the only downfall is that you won’t get to see them as much…”
He and Kroeker didn’t publicly announce they were expecting a baby, but celebrated his arrival in a social media post, writing, “Sharing a precious black and white photo of their baby boy grasping onto each of their thumbs, Rosner wrote, “Our Boy. M.R.R. January, 2026.”
