Thomson Hay Landscape Architects

Our Team

Director, Registered Landscape Architect

David Hay

Since commencing full time work as a landscape architect in July 1988, David has obtained a broad range of experience in a diverse range of landscape projects throughout rural and urban Victoria. David is committed to the protection and enhancement, through appropriate environmental and landscape design treatment, of landscape types ranging from small scale urban and domestic sites to broad scale, regional landscapes. As a director and hands-on landscape architect David is experienced in all aspects of the design process including design development, documentation, cost estimation, contract administration and client and contractor liaison.


Qualifications: 
Bachelor of Landscape Architecture - RMIT – 1990
Graduate Diploma of Forest Science (Farm Forestry) - U. Mel - 1998


Professional Affiliations:

AILA – Registered Landscape Architect

David Hay - Director, Registered Landscape Architect - Thomson Hay

Registered Landscape Architect

Heidi Mikulic

Heidi started full time work as a Landscape Architect in 2007 and has worked on projects in Melbourne, regional Victoria and interstate with a focus on land development, infrastructure and public open space. Project experience includes master planning, design development, documentation, cost estimation, tendering and contract administration.
Heidi works collaboratively with the project team to achieve optimal landscape outcomes and is committed to respecting local environments and cultures in the design process.

Qualifications: 
Bachelor of Design (Landscape Architecture) – RMIT – 2007


Professional Affiliations:

AILA – Registered Landscape Architect

Heidi Mikulic - Registered Landscape Architect - Thomson Hay

Registered Landscape Architect

Yolanda Li

Yolanda has completed her Master of Landscape Architecture at Deakin University and brings a background in art and design to this role, with a passion to learn new design and documentation processes.


Yolanda enjoys using relevant design software and hand sketches to communicate landscape designs.   


Qualifications: 
Master of Landscape Architecture - Deakin - 2017
Bachelor of Public Art - China Academy of Art - 2014


Professional Affiliations:

AILA – Registered Landscape Architect

Yolanda Li - Registered Landscape Architect - Thomson Hay

Graduate Landscape Architect

Priyanka Patil

Priyanka Patil is a skilled landscape architect with expertise in designing functional and visually compelling spaces that enhance both natural and built environments. With experience across public and private sector projects, she has contributed to masterplans, public domain strategies, and detailed landscape designs.


Priyanka specialises in design visualisation, technical drafting, and project coordination, bringing a strong focus on sustainability and usability to her work. Whether developing streetscapes, open spaces, or urban environments, she applies creativity, precision, and a collaborative approach to deliver thoughtful and impactful design solutions.


Qualifications: 
Master of Landscape Architecture - University of Adelaide - 2024
Bachelor of Architecture - Vaishnavi Schoool of Architecture & Planning, India (2019)

Priyanka Patil - Graduate Landscape Architect - Thomson Hay

Office Manager

Karen Horsburgh

Karen is a qualified accountant with a CPA recognition and extensive office management experience.  She has a broad range of experience in the development / building industry in regional Victoria. Karen is an integral part of the office management and supplies support to all areas of the business. 


Qualifications: 
Bachelor of Commerce (University of Ballarat) 1996


Professional Affiliations:

CPA – Registered Certified Practicing Accountant

Karen Horsburgh - Office Manager - Thomson Hay