Atellior, led by Founder and Executive Director Una Barac, RIBA, and Managing Director Ante Marić, crafts sophisticated spaces across the luxury residential and hospitality sectors. Barac's background at Foster + Partners and extensive experience leading hospitality interiors, including the Hilton Bournemouth and projects for Berkeley Homes, informs Atellior's refined aesthetic. Her leadership has garnered awards, including recognition for the Hampton by Hilton Park Royal and the residential project Saffron Wharf. Marić's expertise spans feasibility, architecture, and interior design, with a portfolio showcasing high-profile hospitality projects like the 5-star Boutique Hotel Ikador in Croatia. He currently oversees projects such as the SIRO hotel by Kerzner in Montenegro and the Marina Resort Cavtat.

With studios in London and Zagreb, Atellior boasts a diverse team of over 40 architects and designers, many of whom are women in leadership roles. This collaborative structure, facilitated by a unified platform, allows for seamless teamwork across international projects. The firm's recent work includes collaborations with prestigious brands such as Radisson RED, AC by Marriott, and Leading Hotels of the World. From restoring historic buildings like Cheval Hyde Park Gate to developing the SIRO by Kerzner hotel brand, Atellior's projects reflect a commitment to timeless elegance and meticulous attention to detail. Their portfolio also includes work with InterContinental, Marriott, and several high-end residential developments in London.