Meet Our Team

Working together to deliver leading
interpreting and translation services

Meet Our Team

With over three decades of industry experience and knowledge, ONCALL has adapted to the changing needs of our clients and staff alike. We invest in personnel, technological innovations and infrastructure and have established regional and international offices to continue to meet the growing demand of language services worldwide. Our company headquarters employs a team of dedicated in-house professionals in specialist areas, including client management, information technology, quality control, public and community relations and marketing.

Mustafa Hulusi

Chief Executive Officer

Mustafa officially joined ONCALL in 2007. He commenced employment in the Head Office and has held a variety of roles within the business, dealing with both clients and interpreters/translators, and was responsible for ensuring a high level of service across the board.

Having familiarised himself with the interpreting and translating arenas and community based activities in the local language industry, along with his background in developing new products and business ventures and dealing with International markets, Mustafa was appointed Executive Director of the recently established Global Business Unit where he is responsible for overseeing the global conference interpreting and the translation divisions.

With the backing of an experienced, enthusiastic and driven team, he will see ONCALL further expand into the global market utilising latest technologies and synergies to further establish ONCALL’s global presence in order to offer the highest quality language solutions to all parts of the globe.

Hulus Hulusi


Hulus has a wealth of experience within the language services industry which goes back to the early eighties, providing him with well over 30 years’ experience in service provision. He is himself an experienced and Professional-level NAATI Interpreter and Translator who has successfully managed ONCALL since its inception in 1984, through its periods of growth and expansion.

Hulus has not only kept abreast of community-based interpreting in Australia, but through the formation and success of ONCALL’s conference division, he has travelled the world in order to bring these achievements to other continents. ONCALL have now expanded into Europe (ONCALL EUROPA in Brussels) including the UK (ONCALL Interpreters UK in London) as well as South America (ONCALL LATAM in Buenos Aires). Over the coming 12 months, opportunities will be sought to open branch offices of ONCALL in the Middle-East as well as in Asia.

Hulus is also involved in the recruitment, management and supervision of high level conference interpreters at prestigious international meetings, both in Australia and overseas.

Deniz Hulusi

Executive Director - Quality Programs

Deniz has over 25 years’ experience in the language services industry and with ONCALL. Deniz has a Monash University Bachelor of Arts Degree and has a Post Graduate in Business and Secretarial Studies. She has successfully managed ONCALL through a period of continual growth and expansion. Deniz has been the backbone of ONCALL’s operations since the late eighties, and is currently responsible for the company’s Quality Assurance.

Having completed SAI Global Workshops in relation to ISO Certification and internal auditing in 2014, Deniz is committed to supporting compliance to ISO 9001 Quality standards. Deniz is passionate about the business and focused on continually improving the quality of services across all divisions, ensuring a quality experience for all clients.

Ari Pappas

Executive Director - Marketing & Client Services

Ari joined ONCALL in February 2005. He is responsible for developing business opportunities and contract management for ONCALL Australia wide. He is also responsible for the development and conducting of professional development programs for interpreters as well as cross cultural communication training for professionals working with interpreters.

Ari is a trained NAATI accredited interpreter at the Professional level in the Greek language. He holds a Post Graduate Degree in Health Services Management and a Degree in Social Work. In addition, he is a member of:- The NAATI Professional Reference Group; the Ethnic Communities council of Victoria (ECCV) Health Policy Committee; the Victoria Multicultural Commission Industry advisory committee on Language Services, and other consumer and government groups. He also currently holds membership with other professional bodies in Australia.

Ari has received two prestigious Awards for his outstanding service to multicultural communities relating to interpreting and translating services from the Federation of Ethnic Communities of Councils of Australia (FECCA) and for Meritorious Service in the Community presented by Premier Bracks at the Victorian Multicultural Commission (VMC) 2005 Awards.

His extensive experience has been instrumental in quality assurance, training and expanding the service to the health sector and other service industries, with a passion particularly in the rural areas.

Cengiz Hulusi

Executive Director – Corporate Services

Cengiz is a Certified Practicing Accountant (CPA) with over 30 years’ experience in the service, education, warehousing and manufacturing industries. Cengiz attained his Bachelor of Business (Accounting) degree from Monash University prior to completing the CPA program.

Since 2012, Cengiz’s responsibilities at ONCALL include his role as Chief Finance Officer as well as overseeing ONCALL’s Human Resources and Information Technology divisions. He has carried out similar responsibilities in the education and service industries since 2005.

Cengiz has been a leader in a number of projects including the implementation of various IT systems, implementation of GST at Australian Air Express and review of systems compliance with Y2K for CSR Building Materials.

Nicholas Geeves

Executive Director - National Operations

Nicholas joined ONCALL in 2013. He is responsible for the national service delivery offering whilst overseeing training & development and interpreter relationships.

Having familiarised himself with the Language Service industry, Nicholas has implemented a number of key initiatives to ensure ONCALL provides greater consistency in service whilst ensuring the proactive maintenance of key relationships.

Nicholas promotes transparency across all levels of the business whilst ensuring all stakeholders are equipped with both the knowledge and skills to ensure the highest level of client service.

Through team work and communication, Nicholas looks forward to creating further efficiencies within the business whilst creating opportunities for people to succeed.