Expert Advice

Our people are our strength. Our unique team of caring professionals are proficient in the key areas of occupational medicine, the science behind drug and alcohol testing and workplace health and safety / risk management. Our expert team is here to help – no question too big or too small.

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Associate Professor David Allen

A/Prof David Allen, occupational and environmental physician, brings over 25 years experience in workplace health to the team. David has a unique understanding of how alcohol and other drugs impact not just the individual, but the workplace as a whole. He knows first-hand the increasing risk drugs and alcohol pose in the workplace. He also has vast knowledge and experience with the legal, regulatory and political dimensions of workplace drug and alcohol programs. David’s health professional approach combined with many years’ experience managing drug and alcohol issues in workplaces across Australia, enables DASA to lead the way with solutions that are right for the worker and right for the workplace – every time. David also is managing director of Sydney Occupational Health in Merrylands 

John De Mellow

John De Mellow, medical scientist, has over 30 years experience in scientific technology, specifically in the area of drug testing equipment. John’s methodological expertise means DASA has a strong grasp of the practical aspects of drug and alcohol testing and a solid commitment to technical accuracy. Having worked for many years assessing and using drug testing equipment, John is readily able – and happy – to answer the technical questions. John’s proficiency in this field not only means DASA remains at the cutting edge of this fast moving industry but allows DASA to lead the way with technical know-how.

David and John are supported by a team of professionals with expertise in the areas of workplace health and safety, risk management, training and education and quality management. The depth and breadth of expertise in the team allows DASA to fully understand the complexities - and the challenge - drugs and alcohol pose in the workplace.  


The team’s diversity means all aspects, and all stakeholders, are considered when developing drug and alcohol solutions and that services are delivered with excellence.  A well-rounded and highly experienced team ensures that DASA leads the way with smart solutions that work for you.

We also provide resource materials, fact sheets and newsletters for ongoing support and assistance.

To access our team simply call us on 1300 230 231 or email

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62 Harris St, Harris Park NSW 2150

PO Box 9017 Harris Park NSW 2150

1300 230 231 |

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