Our expertise and people

Covering a range of industry sectors, Six O’Clock is engaged by large, multi-national businesses, small and medium local enterprises, government agencies and departments and non-profit organisations to carry out communications services and provide strategic counsel.

The firm is led by three directors, who combined have more than six decades’ experience in corporate communications, public affairs, marketing communications and journalism.


Nathan Clarke

Senior Adviser

Nathan is a Senior Adviser in Six O’Clock’s Melbourne office. He provides communication counsel to a portfolio of clients within the commercial property, financial services, capital markets and sport sectors.

Nathan has built strong credentials in public policy, communication and stakeholder engagement, having led the government relations and corporate affairs functions for a national peak body in the health sector and served as a political adviser for a Federal Government minister.

Nathan began his career at a leading information technology developer after completing degrees in economics and international relations at Lancaster and Latrobe universities.

Ellen Donald


Ellen is a dedicated communications professional with a keen interest in developing multi-channel strategies that deliver strong client results.

With a background in behavioural change communications, Ellen’s approach to public relations considers the interplay between internal and external relations to achieve positive and measurable outcomes.

Most recently, Ellen has worked on health, defence, sport and transport campaigns for the government and not-for-profit sectors.

Jessica Hales


Jessica is a dynamic communications professional who draws on a strategic and creative mindset to breakdown complex information, develop purposeful content, and build strong relationships.

With experience in corporate communications, internal communications, staff engagement, issues management, media relations, and content strategy, Jessica blends her contemporary expertise with a traditional, considered approach to deliver strong client outcomes.

Prior to joining Six O’Clock, Jessica led a high-performing communications team within the tertiary education sector and successfully managed communications strategies for a range of corporate issues.

Mitchell Hunt

Senior Adviser

Mitchell cut his teeth as a graduate working across regional, rural and agriculture clients a decade ago and has since served as a consultant in New South Wales and the United Kingdom.

With a nose for a good story, Mitchell has since worked with technology, consumer tech, automotive and consumer lifestyle brands, bringing to life campaigns and programs that resonate with media and consumers alike.

At Six O’Clock, Mitchell is responsible for content strategy, development and seeding across traditional and social media and communications and event management counsel.


Genevieve Mills

Group Adviser

Genevieve is a senior communications professional with more than a decade’s experience delivering results to clients in Australia, Asia and the UK.

Genevieve specialises in corporate profiling, media relations, issues management, investor communications, stakeholder engagement, business-to-business and internal communications.

Genevieve’s consultancy experience has seen her work for London-based financial public relations agency, Moorgate Group, Baldwin Boyle Shand in Singapore, and Haystac in Melbourne.

Sonia Bosnar

Business Manager

With extensive experience in office administration and business management, and a strong understanding of the communications and marketing sectors, Sonia keeps Six O’Clock’s back office ticking.

Prior to joining the firm, Sonia managed the office and administration functions of the Australian arm of a leading multinational 3D technology company, overseeing the day-to-day operation of the local team and providing executive support to the Managing Director.

Earlier in her career, she held office administration roles with Melbourne Water, and with Australian Unity where she went on to lead the marketing services function with responsibility for driving the organisation’s brand strategy – working closely with a host of agencies across the creative, communications and media buying spheres.

Sonia studied business and marketing at RMIT.