Contexti Leadership Team

Sidney Minassian
Founder & CEO

Sidney Minassian is the Founder and CEO of Contexti, a premier Big Data Analytics Managed Services company.

Sidney’s professional career and entrepreneurial journey has focused on delivering solutions that leverage structured and unstructured data to solve enterprise decision-making, collaboration and workflow challenges. 

Sidney continues this journey at Contexti, focused on helping customers Create Value from Data™.

Prior to Contexti, Sidney was the Founder and CEO of Liaise, a collaboration product that automatically captures ad-hoc task information from unstructured email content. Liaise, was launched at Silicon Valley’s prestigious DEMO event, won the People’s Choice Award and was named in Gartner’s Cool Vendor listing.

Prior to Liaise, Sidney was the Founder and CEO of Think Software, providing workflow, collaboration and decision-making software for enterprise customers in Financial Services, Professional Services, Telecommunications and Government.

Prior to his technology entrepreneurial ventures, Sidney was a consultant with KPMG, leading strategy, project and change management programs for the Financial Services industry and prior to that he was a Senior Risk Management Officer with Mizuho Bank.


John Zantey
Vice President & CTO

John Zantey is Vice President and Chief Technology Officer at Contexti, a premier Big Data Analytics Managed Services company.

John works with enterprise customers and is responsible for technical architecture, managing service delivery teams and is a lead trainer on Hadoop, NoSQL and related technologies.

Prior to Contexti, John has served as developer, architect and in service delivery leadership roles with UXC Professional Solutions, delivering complex projects in Telecommunications, Government, Financial Services and Manufacturing.

Prior to UXC John was Enterpise Solutions Manager as Sussan, a Senior Consultant with Alorica and held Analytst/Programmer roles with John Sands, Bradman Corporation and Arel Asia Pacific.

Grant Priestley
Chief Architect

Grant Priestley is Chief Architect at Contexti, a premier Big Data Analytics Services company.

Grant leads Contexti's Architecture competency and works directly with customers across all Contexti services lines including Training, Consulting, Integration and Managed Services.

Prior to Contexti, Grant worked at the Commonwealth Bank of Australia (CBA) where he was a Senior Architect in the Information Management Services team. At CBA, Grant was responsible for the end-to-end architecture and operationalisation of CBA's big data analytics and enterprise data platforms.

Prior to CBA, Grant has held architecture, technology and integration leadership roles at Westpac Banking Corporation, Allianz, ING Australia, ING Life Japan, LookSmart International and LookSmart Japan.

Dimitri Cachia
Vice President Operations

Dimitri Cachia is Vice President - Operations at Contexti, a premier Big Data Analytics Managed Services company.

Dimitri is responsible for managing the company's finance and legal operations and works across the marketing, solutions and technical teams to manage the company's internal performance and metrics. 

Previously, Dimitri managed finance and operations functions for high growth companies, SITA and OnAir in Europe.

Prior to that he worked for Deloitte in Corporate Finance and Audit.


Dr Eugene Dubossarsky
Chief Data Scientist

Dr Eugene Dubossarsky is the Chief Data Scientist at Contexti, a premier Big Data Analytics Managed Services company.

With a background in pure mathematics and a PH.D in Computing Science, Eugene brings over 20 years of commercial analytics experience to Contexti’s team and customers.

Eugene is an active and recognised leader in the Asia Pacific and global analytics and data science communities having co-founded a number of organisations and professional bodies including Analyst First, Institute of Analytics Professionals of Australia (IAPA) and Sydney Users of R Forum.

Previously Eugene has held multiple data science and analytics roles including Director of Predictive Business Intelligence at Ernst & Young, Statistician with Insureware and Senior Research Fellow with the University of Technology Sydney.


Mark Kay

Mark Kay is the Chairman of Contexti, a premier Big Data Analytics Managed Services company.

Mark provides strategic guidance to the executive team and leads corporate development initiatives.

Mark is a 20+year veteran of Hitachi Data Systems where he held senior leadership roles based in the US and Asia Pacific.

Most recently, Mark was the Global Head of HDS Systems Integrator business. Prior to that, Mark's roles with Hitachi Data Systems included SVP of Asia Pacific, VP and GM Australia & New Zealand, VP - Global Sales, General Manager South Asia and Country Manager New Zealand.