Get to Know Us
Meet the Team
Mariarosy Calleri
President | Program Director & International Relations Rep
Mariarosy Calleri is an educator with a background in journalism and documentary production. She has been teaching for over 25 years Media Literacy and Filmmaking in the communication departments of Italian and American Universities. In 2009 she was appointed Ambassador and Mentor of Female Entrepreneurship to the European Commission- DG Industry and Enterprise. In 2014 she co-founded R.O.S.A. - Remove Obstacles to Social Awareness with the mission of fighting education poverty on a global level and contributing to social change through education and entrepreneurship. Since then she has been designing and directing experiential learning programs in Europe, Africa and Southeast Asia.
Dennis Andrew Usher
Vice President ICT Expert and Digital Media Instructor
Dennis Usher is an ICT expert and digital media instructor with 40 years international experience in the new media and education sectors. He taught digital content creation at Italian and American Universities in Rome until 2020 when he decided to certify as a life coach. Since then he has been coaching teachers, students and professionals in order to support and foster their personal and career development. He leads meditation retreats in Africa and Asia to help intergenerational participants restore and improve their phsycophisical wellbeing.
Michele Usher
Project Manager & Software Developer
Michele Usher graduated from Bocconi University in Milan with a degree in Economics, Management and Computer Science. He is a certified instructor in Python, Digital Literacy and Game Design. He has gained experience in both the profit and non profit sector by teaching for the global franchise Algorithmics as well as for R.O.S.A.'s international programs. Currently, he is coordinating the development of a cutting edge, in-house, e-learning platform for R.O.S.A.'s teacher training programs.
Tania Khan
Full Stack Web Developer
Tania Khan is a final-year digital marketing student with a strong passion for both strategy and technology. Alongside her studies, she is honing her skills in programming, while contributing to our organization as a full stack web developer. She has hands-on experience with WordPress and Django, creating functional, and well-structured websites. She enjoys blending marketing ideas with technical skills to build smart, and effective digital solutions.
Kayla Liu
IT Expert and CTO
Kayla Liu is an Applied Scientist with dual MS degrees in Computer Science and Chemical Engineering, and 5+ years of R&D experience turning AI/ML into real-world impact. Passionate about using technology to solve meaningful problems—from education and social good to consumer and commercial products. Enjoy leading cross-functional projects that bridge research and application.
Rosangela Bruno
Website Designer & SEO Strategist
Rosangela Bruno is a SEO Strategist with a strong background in marketing and user experience. She holds a B.A. in Advertising and a UX/UI Design certification, combining creativity with technical expertise. Driven by her passion for technology and digital strategy, Rosangela focuses on the website ecosystem and SEO optimization, helping businesses and organizations create websites that truly connect with their audiences and drive measurable results.
Jennah Nguyen
Marketing & Social Media Specialist
Jennah Nguyen has a BA in Marketing from CSU East Bay. With over 10 years of experience in social media marketing across various industries such as technology, fashion, ecommerce, and travel, she currently works as a freelance Social Media Consultant and Event Planner/Coordinator based in California. Her contribution to R.O.S.A.'s digital marketing and social media strategy has been invaluable.
Svetlozara Zlatanova
Content Creator and Social Media Manager
Svetlozara Zlatanova collaborates with R.O.S.A. as a video content maker, contributing to the creation of educational content and online resources for R.O.S.A.'s professional development programs designed to upskill students and teachers in the local communities where we operate through government and institutional partnerships. Currently studying Law at New Bulgarian University, she combines her sense of creativity with a strong interest in human rights and communication.