Chef Rolka has worked in a wide array of establishments, from 3-Michelin star Martin Berasategui in Spain to some of Detroit's best restaurants, (Dime Store, Republic Tavern, Takoi in exile, Takoi, and Marrow.) His role in the opening of such prominent Detroit restaurants led him to the opening of Mink in Corktown, Detroit in November 2019. Mink is a small 17 seat restaurant featuring a seasonally influenced and constantly rotating selection of oysters, a seafood based tasting menu, caviar service, and a wide selection of curated tinned seafoods. Impeccable sourcing from local farms, a diverse list of oyster farms, sustainable seafood, and high end ingredients sets chef Rolka apart. Cutting his teeth at Mink served as the perfect training ground for the launch of Umbo.

Sarah Welch is a Founding Member and Partner at Marrow. She is also the co-Founder of seafood-centric restaurant Mink in Detroit's Corktown. Marrow was voted a semi-finalist for Best New Restaurant in the country by the James Beard Foundation in 2019, and in that same year was named one of the top new restaurants by Eater. Since then, Sarah has been nominated four times for James Beard Foundation's Best Chef in the Great Lakes category making it to finalist in 2023. Sarah competed in Top Chef: Houston in 2022 and was one of 3 finalists. Sarah trained formally at the renowned International Culinary Center in NYC after getting a business degree at Michigan State University. Her time as chef and partner at Marrow & Mink respectively has primed her appetite for her debut running the front end of Umbo. 

Angus oversees Umbo’s most essential operations: quality control, team morale, and snack security. With a background in persistent observation and a nose for detail, he ensures every product and process meets the highest standards—especially if treats are involved. Known for his calm leadership style and unwavering commitment to office culture, Angus brings a balance of both discipline and delight to the workplace. When not performing site inspections, floor managing, or supervising meetings he can be found frocklicking around the outdoor parks of Traverse City in search of life’s next great adventure. While he’s been known to engage with newcomers with a bit of intensity and fervor, he’s really just a silly little guy. Most times you can find him in his favorite cold floor spot engaging in his favorite professional development activity: napping with a purpose.