Our Executive

Ed Holmes

Chief Executive Officer

Ed is an experienced finance executive with extensive experience in the corporate and NFP sector having worked in senior roles across disability, aged care and justice before joining Unison.  Prior to entering the community sector Ed was in senior management roles in the corporate sector in mining and manufacturing.  

He holds a Bachelor of Commerce (CPA) and his financial experience covers many areas, including analysis of major capital projects and manufacturing accounting, external and internal financial reporting and company secretarial requirements. In addition, Ed has experience in  Information Technology, Communications, Fundraising and Human Resources in the corporate and NFP sectors.


Tanya Armstrong

Director Housing and Homelessness Services

Tanya has broad skills in operational and people management with over 12 years’ experience in the housing and homelessness sector. Tanya has also managed operations in a growth environment with a focus on service development and positive change.  

Prior to joining Unison, Tanya held senior roles in the community housing sector, most recently in homelessness services as a General Manager at Launch Housing where her portfolio included housing support programs, youth support and youth foyers. 


Simon Greenfield

Director Asset Management

Simon is an experienced property executive with diverse skills across the full asset lifecycle.

He holds a Bachelor of Design (Hons), and is a highly motivated leader with a successful track record of delivering large-scale and complex property projects in senior roles covering strategic consultancy, project delivery, and property operations. His key strength is developing innovative solutions that optimise asset performance and enhance human experience in the built-form environment.

Prior to joining Unison, Simon was a senior leader at a global property and professional services firm with oversight for a broad range of services to ASX10 corporations.

Sarah Toohey

Head of Strategy and Communications

Sarah is a policy and communications specialist with over ten years experience in the housing and homelessness sectors.

Prior to joining Unison Sarah worked as the Manager of Policy and Communications at the Council to Homeless Persons, Victoria’s Peak body for homelessness services. Sarah was also the campaign manager and spokesperson for Australians for Affordable Housing, a national alliance of community and housing organisations campaigning to improve the supply of affordable housing.  Across her career Sarah has worked for State and Federal Governments and peak bodies working to address poverty and social disadvantage.

Sarah holds a Bachelor of Arts (Political Science), Diploma in Creative Arts (Media Studies) and Masters in Urban Planning and Environment.