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At Simble

we enable the agile enterprise with smart and nimble Software as a Service (SaaS) technology solutions.


Our software will give your business an edge by helping you mobilise your workforce and identify energy saving opportunities across your operations.


This will improve productivity, reduce operational costs and enhance engagement with your employees, customers and suppliers.

Simble (formerly Acresta) is a global company with headquarters in Sydney

and offices in Melbourne, Auckland, Da Nang, Dubai and London,

that has been providing solutions to businesses since 2009.

The success of Simble is built on four guiding pillars:


Our DNA is technology – we hire the best talent and partner with like-minded innovators to ensure we stay ahead of the game.


Courage to respond to changing market needs, enabling our customers to identify opportunities for improved business outcomes.


We strive to offer the best solutions for our customers with a focus on quality and speed to market in everything we do.


Continuous delivery of sustainable business growth in partnership with our customers and partners.

Why do we exist? We have the courage and unique insight to leverage our smart and nimble software solutions to help you and your teams thrive by building a sustainable business. And at the end of each day, we are proud knowing that everyone benefits, and that in the process, we are contributing in a small way to helping shape a sustainable world

Fadi Geha CEO, Simble

Every Simble solution is:

Meet our management team:

Fadi Geha

Fadi Geha

CEO and Executive Director

Fadi is an engineer with over 25 years experience in enterprise software sales, consulting, and IT M&A. He is the founder of Acresta (now part of Simble) and has served as its CEO for the past seven years. Fadi has held senior management positions with SAP Australia and Accenture. From 2003-2006 he served as Vice President Asia Pacific and Director at Viewlocity Technologies and led Viewlocity’s expansion into the Asian region including the acquisition of key clients in Japan, Korea, and South East Asia which resulted in Viewlocity being named top IBM partner in Australia for SaaS offerings in 2005.

In 2006, Fadi facilitated the M&A activity that resulted in the acquisition of Viewlocity Inc by Supply Chain Consulting. Fadi joined the executive team at Supply Chain Consulting and in 2009 Fujitsu Australia acquired Supply Chain Consulting for $48 million. Fadi holds a Bachelor of Civil Engineering from the University of Sydney. He is also a Director of Sustainable Business Australia – Australia’s leading business think tank and advocacy group promoting commercial solutions to environmental challenges.

Mark Duke

Mark Duke

Chief Financial Officer

Mark is a finance executive with more than twenty-five years’ experience in multi-national firms operating in Europe and Australia through all life cycles of an organisation. Mark joined Simble in August 2017 as the Chief Financial Officer and oversees the financial and operational functions of the group.

Most recently, he spent 14 years with Findex subsidiary, Crowe Horwarth Australia, serving various positions including Chief Executive, Chief Operating Officer and Chief Financial Officer of the Sydney firm. Mark also served as Vice President – European Finance for Security Capital Group throughout its NYSE listing, prior to its $4 billion takeover by GE Capital. Mark is a Chartered Accountant, a Graduate of the Australian Institute of Company Directors and is also a PRINCE2® Practitioner.

Martin Hannah

Martin Hannah

Chief Technology Officer

Martin is a technology advocate executive with more than 30 years of experience working with businesses of all sizes within the Finance, Manufacturing, Not for Profit, and NGO sectors in Australia, NZ and SE Asia.  Martin has joined Simble as Chief Technology Officer and will be responsible for driving Simble’s innovation agenda in Technology and R&D as well as overseeing service delivery and channel fulfilment.

Most recently Martin has been integral in the research, design and development of smart IoT device technologies and associated software applications, resulting in successful implementation across multiple industries. Previously as Managing Director of Coresoft Pty Ltd, Martin successfully grew the Enterprise software applications company positioning it as the dominant provider and leading innovator within the sector. Martin has also held the position of Director of Global Coresoft which is a joint venture with Global Yellow Pages Singapore to supply Cloud based Industry solutions throughout SE Asia. With a Diploma of Project Management, Martin has also successfully completed an MBA.

Bill Dimopoulos

Bill Dimopoulos

Head of Sales and Marketing

Bill is an enterprise ICT professional with over 25 years experience in sales, marketing and leadership positions. He has a track record of building the revenue profiles of SME and start up businesses to in excess of $100 million and driving mainstream adoption of new technologies.

Bill spent 15 years with HP Australia, during which he oversaw a multi factor rise in sales of its commercial volume hardware, software and networking products. Concurrently, Bill also drove a rise in each category he managed from a top five to top two market share position in the ANZ region. He joined Hutchison Telecom Australia prior to the critical launch of its domestic 3G services, laying the foundation channel partnerships which supported growth of its SME sales. During his tenure with Singtel Optus, Bill oversaw the digital enablement of key channels in the SME & mid market sectors which improved customer engagement, accelerated business opportunities and significantly improved conversion rates. Recently, Bill has also served in senior management positions at Symantec, NBN Co, and Oakton.

Bill’s leadership roles have included Enterprise Sales & Territory Management, Channel Sales Management, Business Unit Management, Head of Channel Marketing, Marketing Director and General Management capacities.

Kalana Navaratne

Kalana Navaratne

Head of Strategy

Kalana Navaratne is a transformation and technology professional in the utilities and smart home industries. Over the last fifteen years he has worked for three of the UK’s big six utilities, including EON, RWE Npower, and British Gas in multiple capacities covering big data analytics, non commodity (Smart Home) services, and corporate strategy.

He has an intimate knowledge of the structural and legislative changes impacting the UK utilities landscape as well as new technological opportunities facing the sector. Kalana brings a track record of delivering and implementing transformation strategies designed to enhance conversion rates, customer experience and long term stakeholder value.