Our Leadership Team

Graham Cock

Managing Director, Ace Contractors Group

Graham has worked in the civil and contracting industry for the past 50 years.
During this time he successfully started G&H Cock as a contracting business, which has developed and grown into the Ace Contractors Group of today.

In addition to the civil company, Graham has developed farming enterprises throughout Victoria and New South Wales.

Warren Higgs

CEO, Ace Contractors Group
Warren Higgs

Warren has more than 30 years experience managing challenging major projects, including road, bridge and water contracts in Australia and overseas. As CEO of the Ace Group of Companies since January 2008, Warren has restructured the company into a 7 distinct subsidiaries, each focusing on specific areas of expertise, viz: Civil, Infrastructure, Landscape, Environment, Water, Electrical and Plant.

Geoff Frost

CFO, Ace Contractors Group

Geoff has worked in the financial arena for the past 24 years. During this time he has worked in both the Australian and overseas markets. Since starting with the Ace Group of companies in 1994, Geoff has assisted in the rapidly expanding business, using a wealth of financial and business knowledge gained over his career.

Mark Callahan

Construction Manager, Ace Contractors Group

Mark CallahanMark has more than 35 years local industry experience and for the last 15 years has fulfilled the role of Construction Manager for a number of major Construction Industry contractors in Melbourne. As such, Mark has mentored many young engineers and built successful, collaborative construction teams.
Mark has particular interest in, and knowledge of heavy industrial and Transport sector pavements .

Simon Cock

Victoria Operations Manager, Ace Contractors Group

Simon_Simon has worked in the farming, contracting, civil and landscape fields for the past 27 years. He currently oversees all projects delivered by the Ace Group. Simon assists our Project Managers to ensure safe, efficient and effective implementation of building practices on the work site.

Brendan Haynes

Manager – Group Projects, and General Manager Ace Civil Services

Brendan is the Manager Group Projects at ACE. With knowledge obtained from working in construction both within Australia and overseas, Brendan is accountable for the effective implementation of projects and the growth of the Civil business. Brendan actively provides support to project teams, to identify solutions for day to day construction issues, and support business objectives.

Georgina Day

Business Development Manager, Ace Contractors Group

Georgina has more than 20 years of construction experience, gained within Australia and internationally.  Her previous roles include Project Manager, Contracts Manager, Project Services Manager, Project Controls Manager and a variety of Business Development roles.  Georgina brings a diverse set of experience having worked in the transport, oil & gas, power and water industries prior to her tenure at Ace.


Asoka Chandrawanka

General Manager, Ace Infrastructure

Asoka has over 30 years experience in civil construction, with considerable expertise in bridges, roads water, and sewerage infrastructure. He has worked extensively throughout Melbourne and regional Victoria, taking on projects that require innovative design, engineering and construction solutions.

Russell Moore

General Manager, Ace Landscape Services


Russell has over 20 years experience in both commercial and residential landscape projects. Russell oversees ACE’s landscape projects, estimating, planning and business operations, whilst supporting Project Management staff in delivering the best project outcomes.

Tony Barker

Manager – Bulk Earthworks & Mining


Tony has over 20 years experience in civil construction, in both Victoria and Western Australia.  His experience is varied and includes works on mine sites, road reconstruction works, wetland construction, landfill capping, and overseeing the operation of over 330 pieces of plant and equipment. Tony’s current focus is expanding ACE’s bulk earthworks and mining capability.

Randhir Kumar

General Manager, Ace Electrical Infrastructure

Randhir has over 20 years of Heavy Industrial Experience in the water and power industries including the design, manufacture and testing of power supply boards, motor control centres, control panels, instrumentation, telemetry/alarm systems and associated works.

Anita Cossenas

Human Resources Manager, Ace Contractors Group

Anita has over 11 years’ experience in performance management, induction & on-boarding, end to end recruitment, counselling and grievance handing, along with ad hoc project work. She is interested in enhancing the people focus of business, by assisting managers to better manage and resource their employees in order to achieve business outcomes. Anita also sat on the board of directors for an international not-for-profit organisation, where she was responsible for organisational strategy and chairing the Human Resources & Board Development sub-committee.

Paul Maxwell

Occupation Health & Safety Manager

Paul Maxwell, HSEQ Advisor

Paul has over 10 years’ experience in occupational health and safety, in the fields of transport, supply chain, warehousing, shipping and recycling, in both Australia and New Zealand. He is passionate about safety and is a strong team member with a dedicated, disciplined and consultative approach to HSEQ.

John Morrow

Construction Technology Consultant

John MorrowWith extensive experience in the construction technology field, John Morrow has held a variety of positions, and worked on a wide range of projects within ACE’s Civil, Landscape and Infrastructure businesses.  As Technology Manager, John researches and implements technologies across ACE’s projects to enhance accuracy, efficiency and safety.

Rena Lord

Systems Manager

Rena Lord, Systems ManagerRena’s role at ACE involves working with the CEO, General Managers and HSEQ Advisor to improve the company’s Standard Operating Procedures. She provides training to all staff, both in the office and on site. Rena also conducts regular internal management audits and works with the HSEQ Advisor for onsite matters.