Who plays Liam in “Sullivan’s Crossing”? Meet Marcus Rosner

Marcus Rosner plays a decisive role in season 4 Sullivan’s Crossing Liam, who plays Maggie’s secret husband.

The third season of the hit series, Start streaming to air on Netflix in August 2025, initially hinting at Maggie’s (Morgan Cohan) For example, when she mentioned Liam (Rosner) to Laura (Amalia Williamson) was her summer sweetheart before finishing medical school. Maggie and Liam lose touch after a cute encounter while traveling abroad.

Liam was brought up again when CalChad Michael Murray) discovers letters written by Maggie to Liam explaining why their relationship couldn’t work long-term because she wanted to prioritize her career.

The focus for the rest of the season is About Maggie and Carl’s relationship. Although they are not officially a couple, they face some challenges, including Carl reconnecting with his estranged father, who is terminally ill.

Maggie supports Carl through difficult reunion after they return to Sullivan’s Crossinghe invites her to move in with him. As the season comes to an end and they begin planning their future, a guest who checked in earlier in the day reveals himself to be Liam. Then he shocked CarlCalls himself Maggie’s husband.

Season 4, which premieres on Monday, April 20 on The CW, will feature flashbacks that provide a deeper look into Liam and Maggie’s romance before they moved to Canada. Keep scrolling to learn all about Rosner:

Before “Sullivan’s Crossing,” what had Marcus Rosner starred in?

Marcus Rosner’s most famous roles include fantasy, arrow, supernatural and once Upon a time. He is also a very stable person Appearing in Hallmark Movies For example Autumn on the Vineyard, Love on Harbor Island, Romance of the Rescue, Christmas Flip, Right Love and Falling like snowflakes.

What does Marcus Rosner share about his personal life?

In December 2020, Rosner announced his engagement to his long-term girlfriend Alison Crook. They got married a year later. In January 2026, the couple welcomed their first child.

How much did the cast know about Liam before he made his “Sullivan’s Crossing” debut?

Morgan Kohan previously teased the surprising twist, telling Swoon in July 2025, “I remember hearing a little bit[about Liam]early in season three. I didn’t know they were married. When we were filming the scenes with Lola and Summer Bash, there were discussions. I knew he was going to be a part of it, but I didn’t really know when or in what capacity. That gripping story was fun for me to read, too.”

Cohan admitted that Maggie’s fear of getting serious with Carl may have come from her past with Liam, adding, “I feel like it came up at the last minute and I didn’t really have time to think about it, but I think it definitely would have. Of course, it would have made more sense for her to be more hesitant.”

The actress noted that she knew nothing about Liam’s character as a viewer in Season 4.

“At the same time, I still don’t know the history, so who knows when we’re going to find out more about what he actually meant, that he was her husband and that sort of thing,” she continued. “I mean, there’s got to be some dialogue[between Maggie and Carl]. It’s going to be something that has to build trust again because it’s a very important thing to ignore.”

Can Liam break up Carl and Maggie in “Sullivan’s Crossing”?

showrunner Roman Ross tease What does the arrival of new people mean? For Maggie and Carl.

“There’s never a dull moment on ‘Sullivan’s Crossing,'” Ross told Collider in July 2025. “A romantic drama requires a push and pull between characters… We’re going to have quite a big ups and downs at the end of the season, and we’re going to see that in Season 4.”

Ross said she hopes Season 3 will reflect the theme of “second chances,” sharing, “These characters go through a lot over the course of two seasons. We wanted to give them a chance to explore love. I think that’s what we actually said in one of the scripts.”

Rose concluded: “Because we’re dealing with a lot of emotional issues, we wanted this season to have some levity and levity, give people a break and give them some hope and positivity in life. Continuing the journey from the head to the heart – full of emotion, drama and a few surprises.”

How did Marcus Rosner transition from acting?

In addition to appearing in front of the camera, Marcus Rosner also serves as director and screenwriter for the project.

2026 4 “I’ve been lucky enough to have a very privileged career, both in front of the camera and as a producer, but in a lot of ways it all seemed like a work-in-progress to become a director,” he told the Northern Arizona Times in March. “Acting is still my favorite part of the process, those moments between the action and the edit, but directing provides a different kind of creative satisfaction. Having that level of control allows you to be engaged and creatively stimulated throughout the day, and that’s what I’m hoping for.” I found myself really craving it. “

He added: “My background has been extremely valuable in this transition. Acting gave me a deep understanding of acting, and producing taught me how to really put a film together. Together, these experiences made my journey into writing and directing feel grounded and purposeful. I have a clearer sense of what is achievable, what is interesting, and how to shape a visual and tonal language that is unique to me.”