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blockchain Committee

Terms of Reference    
  • Mr Mohammed Khaiata


    Mohammed is a digital transformation expert who successfully led and delivered complex large digital transformation programs, devised and executed IT strategy to have a higher level of alignment with business, streamlined business operations and functions by reengineering business processes and implementing integrated business systems. Mohammed is a TEDx speaker and a Board Member of several renowned organisations like the Australia and New Zealand Academy of Management ANZAM and the Centre for Islamic Economics Australia CIEA. Mohammed is certified in Project Management (PMP), Information Systems Audit (CISA), Information Technology Management (ITIL), Building Internet Applications (OCP) and cloud technologies. He holds a Masters degree in Information Technology Management, a Post-Graduate Diploma in Artificial Intelligence and a Bachelor degree in Computer Engineering. Mohammed is due to complete his PhD in emerging technologies from the University of Western Australia by the end of 2021.

  • Mr Simon Callaghan

    Vice Chair
    MACS Snr

    Simon is Head of OTC Markets at Celsius. Celsius is a decentralised finance company. With over 15 years' experience, Simon previously worked at the Australian Trade & Investment Commission, where he led fintech and blockchain engagement in New York, including the Australian Blockchain Mission to Consensus 2019. Prior to this, Simon worked for global IT services firms across Australia and the US, and led engagements in Asia, Europe, and LATAM, within the banking and financial services sector. His technical background is in spatial technologies. Simon holds an MBA from AGSM and a Master of Science from Carnegie Mellon.

  • Mr Ambarish Natu


    After graduating from UNSW, Ambarish has held positions as a visiting researcher in Italy and Taiwan, worked for industry in United Kingdom and the United States of America and for the past nine years has been working in the Australian Public Service.For the past 17 years Ambarish has led the development of five international standards under the auspices of the International Standards Organization (ISO) popularly known as JPEG (Joint Photographic Experts Group). He is the recipient of the ISO/IECcertificate for contributions to technology standards. Ambarish is highly active in the area of international standardization and voicing Australian concerns in the area of JPEG and MPEG (Motion Pictures Experts Group) standardization. Recently, he initiated an effort in the area of standardization relating to Privacy and Security in the Multimedia Context both within JPEG and MPEG standard bodies.In 2015, Ambarish was the recipient of the prestigious Neville Thiele Award and the Canberra Professional Engineer of the Year by Engineers Australia. Ambarish currently works as an IT Architect within the Australian Taxation Office. Ambarish currently also serves as a committee member on the ITEE College Board, the ITEE Canberra Branch committee of Engineers Australia and is also served as Vice-Chair and Treasurer for the IEEE Canberra Section.

  • Ms Christy Jie Liang


    Christy leads Data Visualisation Research Lab at the University of Technology Sydney (UTS), whose research interests focus on Data Visualisation and Visual Analytics Science Technology. She was a recipient of UTS University Medal with First Class Honours, Capital Markets CRC scholarship and Australian Postgraduate Awards. She had global appointments, including IBM Australia in Strategic Data Analysis, and Peking University in Visual Analytics Research. Her Honours research contributed to stock market surveillance work, and her doctoral and later research has substantially contributed to the fundamental research in information visualisation and visual analytics. Her research has been widely applied to the other domains, including blockchain, finance, food safety, bio-medical, smart city, and social media. She owns 4 intellectual properties. She has lead as chief investigators in a number of multi and trans-disciplinarily collaboration with Australian government, domestic and international industry and academic partners. She develops and coordinate a number of new enterprises and educational learning online courses, including short courses, micro-credentials in data visualisation field.

  • Mr Samuel Brooks


    Samuel Brooks is Chief Technology Officer at Block8, a leading distributed systems engineering company based in Sydney, Australia. After completing his degree in Electrical Engineering at UNSW, Sam worked as an engineer, analyst and project manager within energy and financial services. He has a key interest in the power of distributed software systems to create new value for the world, and sometimes writes about blockchains on his blog at

  • Mr Stefano Tempesta


    Stefano Tempesta works at Microsoft in the Azure Confidential Computing product group to make the Cloud a more secure place for your data and apps. Additionally, as advisor to the Department of Industry, Australia, on the National Blockchain Roadmap, his current focus is on helping people gain and own their digital identity. Stefano is also a technology advisor to Carbon Asset Solutions, a climate action and sustainability network with a mission to slow carbon dioxide emissions and remove excess atmospheric CO2 by using regenerative agriculture technologies.

  • Mr Tom Worthington


    Tom Worthington is an independent computer professional, award winning educational designer and an Honorary Senior Lecturer in the Research School of Computer Science at the Australian National University. He previously worked on IT policy forthe Australian Department of Defence and HQ Australian Defence Force. In 1999 Tom was elected a Fellow of the Australian Computer Society for his contribution to the development of public Internet policy. He is a Past President, Honorary Life Member, Certified Professional and a Certified Computer Professional of the ACS as well as a voting member of the Association for Computing Machinery and a member of the Institute of Electrical and Electronics Engineers.