Evan Haryadi is a Mechanical Engineer with three years of experience in the pharmaceutical industry, specialising in validation engineering, quality assurance, and project management. He has worked extensively on the validation of both new and existing pharmaceutical equipment, including installation qualification (IQ), operational qualification (OQ), and performance qualification (PQ), ensuring systems operate as intended while maintaining regulatory compliance.

He holds a Bachelor’s degree in Mechanical Engineering from the University of Houston, Texas. Evan brings a strong technical background and a detail-oriented approach to engineering projects, with a focus on operational efficiency and compliance standards.

Dr Dilhani Perera is a plant scientist and agricultural advisor with over 20 years of experience working across Australia and internationally. Her expertise spans applied research, field trials, and advisory roles across the private, government, and higher education sectors.

She holds a PhD from Charles Sturt University, an Honours degree from the University of Adelaide, and both Bachelor’s and Master’s degrees from Sri Lanka.

At Siena Group Pty Ltd, Dr Perera develops practical, science-driven solutions that support sustainable agriculture and environmental remediation. Her current work focuses on evaluating alternative biomass feedstocks for biochar production, including fast-growing legumes, and exploring innovative applications of biochar for soil improvement, carbon sequestration, and stormwater filtration.

Dr Perera is passionate about translating scientific research into practical solutions that help farmers improve productivity while supporting long-term environmental sustainability. Through her work, she aims to contribute to more resilient agricultural systems and innovative approaches to carbon management.

Dr Vincent Fernon is a gastroenterologist by profession, with a long-standing passion for agriculture, particularly broadacre farming. Over the years, his interest in sustainable farming practices has continued to grow, leading him to explore innovative ways to improve soil health and reduce agricultural waste.

His interest in biochar developed through a simple yet powerful observation. While travelling through farming regions, Vincent often found himself pausing at the sight of stubble left behind after harvest, wondering how this agricultural residue could be transformed into something valuable rather than being burned or wasted. He began envisioning ways to convert farm stubble into a resource that could enrich soils while reducing carbon emissions.

This curiosity led him to the world of biochar and ultimately inspired the creation of Siena Carbon Group. Through the company, Dr Fernon is committed to promoting the sustainable use of agricultural residues by converting them into stable carbon products that improve soil health and sequester carbon for centuries.

In addition to agricultural applications, Vincent also envisions biochar playing a significant role in environmental remediation, particularly in stormwater filtration systems. He believes biochar can serve as a sustainable filtration medium to help remove pollutants, improve water quality, and support healthier ecosystems in both rural and urban environments.

Through Siena Carbon Group, Dr Fernon aims to drive practical, science-based solutions that contribute to carbon sequestration, sustainable farming, and environmental restoration for future generations.

Climate change mitigation through long-term carbon sequestration

Sustainable agriculture and soil carbon enhancement

Improved water quality through nature-based filtration systems

Circular economy by diverting agricultural waste from burning

Biodiversity outcomes through regenerative land practices

We actively support

Agriculture and soil systems

Stormwater and catchment management

Environmental remediation

Carbon farming and offset projects