Grace Nungesser Prior to becoming Director of Group Sales for the Las Colinas boutique hotel, Nungesser was Sales Manager at the Omni Mandalay at Las Colinas and the Corporate and Association Catering Manager at the Crowne Plaza Dallas Near the Galleria-Addison Hotel. Grace boasts more than 15 years of experience in the hospitality industry, and excels at establishing long-term relationships with clients.