Executive Team

Executive Team

Justin Roia

Chief Executive Officer


For over 30 years Justin has gained extensive experience across a range of local and international roles in a variety of sectors across the consumables and chemicals industry. Justin’s accreditations include Graduate of the Australian Institute of Company Directors, Bachelor of Business Management, Bachelor Of Science, Graduate of the INSEAD school of Leadership.

In his spare time Justin enjoys participating in charity events and supporting the community. Justin believes that people’s needs come first above all and one of his favourite sayings is “facts are our friends”.

Nick Sieveking

Chief Operating Officer

BEng in Chemistry

Nick manages the Strategic Business Centre that includes planning, customer service, purchasing, logistics, quality and compliance, project management and laboratory functions.  He has gained over 25 years’ experience in supply chain and operations across various disciplines like FMCG, Personal Products, Pharmaceuticals, Industrial and Specialty Chemicals. Nick graduated from Sydney University with BEng Chem.

In his spare time Nick enjoys spending time with family and occasionally sampling craft beer which he also attempts to brew at home!  Nick’s favourite quote is “The only constant in life is change”.

Robin Vandekreeke

Group Chief Financial Officer


As Group CFO, Robin leads our Finance and Accounting functions.  He has 29 years of experience in finance and supply chain roles across FMCG, Agribusiness, Pharma, Construction, eCommerce and Manufacturing in private and public companies across 3 continents. Robin has a Bachelors degree in International Commerce from Brown University in Rhode Island, USA and an MBA in International Business from the American Graduate School of International Business in Arizona, USA. He is also a CPA.

In his spare time, Robin is a surf-mad, active husband and father, passionate about supporting his local community in the Northern Beaches of Sydney.

Andy Koh

General Manager, Advanced Solutions

PhD in Chemistry, MBA

Andy manages the Agriculture, Mineral Processing, Oil & Gas, Coatings, Corrosion, Construction and Water market segments.  With over 16 years in the industry, Andy has extensive experience in Crop Protection, Coatings, Health Care, Nutraceutical and Animal Health. He obtained his PhD from Adelaide University and MBA from Macquarie University.

Andy enjoys regular visits to the gym and spending time with his family. He believes that “people fail only if they do not try”.

Jaime Wallace

Country Manager, New Zealand

BSc in Biology & Chemistry

Jaime oversees the New Zealand business and has led the Performance Ingredients team in New Zealand for the past 5 years.  She has over 22 years in various commercial roles in the Healthcare, Pharmaceutical, and Personal Care industries in both the United States and New Zealand.  Jaime earned a Bachelor of Science degree in Biology and Chemistry in the US and is currently completing an Executive MBA.  Jaime is a board member of Cosmetics New Zealand.

In her spare time, Jaime enjoys gardening and hiking with her husband, chicken-wrangling, and traveling to new destinations.  A favourite quote of Jaime’s is from Mark Twain: “The secret to getting ahead is getting started”.

Lyn Shields

General Manager, Marketing & Innovation

BBus in Marketing

Lyn Shields is responsible for all marketing strategy across the organisation and has extensive experience across many industries including FMCG (household & food), Imaging and Sports marketing. Lyn graduated from University of Western Sydney with a Bachelor of Business degree with a Major in Marketing.

Lyn is a passionate supporter of the Manly Sea Eagles rugby league football club and also walks and swims at the beach on a regular basis. Lyn loves the quote “Good marketing makes the company look smart. Great marketing makes the customer feel smart”.

Michael Lawrence

General Manager, Performance Ingredients

GradCert in Management, MBS

Michael currently oversees the sales and distribution of personal care, household & institutional specialty chemicals and food ingredients across ANZ. In over 10 years with A S Harrison & Co, he has had responsibility across several markets such as fuel & lubricant additives, water treatment, oil & gas, mining, and construction specialty additives.

Michael has almost 25 years sales and sales management experience across Australia, New Zealand, the United Kingdom and the United States. He has acquired a Graduate Certificate of Management and is currently studying an MBA at Macquarie University.

Michael’s favourite quote is “Success doesn’t find you; you have to go out and get it”.

Philip Fleming

General Manager, Strategic Business

BSc in Industrial Chemistry, MBA, FRACI, CChem, GAICD

With over 40 years’ experience, Phil has worked across all areas of the business since 1995. His expertise includes R&D, product management, logistics and technical sales. Phil holds a BSc in Industrial Chemistry, an MBA, is a chartered chemist, a Fellow of the Royal Australian Chemical Institute, and a Graduate from the Australian Institute of Company Directors.  His role covers several areas of the business including our strategic relationships with channel partners.

Phil enjoys crossword puzzles and various outdoor activities. He believes that success in business comes from doing what you enjoy and doing it well. 

Robert Devitt

Group Business Technology Manager

BSc in Information Technology, PMP

Rob manages Group Business Technology which includes ICT, Projects and Processes. He has close to 20 years experience supporting the technical needs of businesses across FMCG, Pharma and Manufacturing. Rob graduated from Technical University Dublin with BSc in IT and achieved his PMP certification in 2011.

In his spare time, Rob likes to spend time with his family and enjoys playing and watching soccer. Rob’s favourite quote is The most dangerous phrase in business is – We’ve always done it this way”.

Robert Feltrin

General Manager, Organisational Development


Rob has been with the company for over 5 years and has extensive Human Resource experience across a range of sectors. Rob holds a BCom, MAHRI, LDP from Sydney University and was a finalist in the 2020 & 2021 HR Manager of the Year for Australia and awarded “Australian Employer of Choice” 2020 & 2021.  

In his spare time, Rob likes to spend time with his family, and explore the great outdoors of Australia. Robs favourite quote is “Every problem is a gift—without problems we would not grow.”

Thomas Haskell

General Manager, Energy Efficiency

BE Chemical Engineering, MBA

Thomas oversees the sales and distribution of Fuel and Lubricant additives in Australia, New Zealand, and Asia. He has over 10 years of experience in commercial and operational roles across lubricants, fuels, mining, and manufacturing. Thomas has a Bachelors degree in Chemical and Biomolecular Engineering from Sydney University and an MBA from Macquarie University. He is also an active Board member of the Australian Lubricants Association.

In his spare time, Thomas likes to get outdoors bush walking and mountain biking, and spending time in his garden growing fresh food to use in his cooking. He believes that there is always something to learn from everyone you meet and, often, the best solution to your problem is in someone else’s mind.


Success Stories

Product and customer insights

View all

Contact Us

A S Harrison & Co is committed to providing the highest level of customer service. Please drop us a line and we will get back to you soon.