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Members of the Board


Responsible for the strategy, governance and direction of OHTA


The Board is responsible for the strategy, governance and direction of OHTA. It 
has developed following a series of constitutional changes designed to enable greater involvement from IOHA and member associations and to ensure a sustainable rate of growth for OHTA. 

The Board consists of 11 individuals who are actively engaged in building OHTA. Some are business leaders and senior professionals within national occupational hygiene associations, others are senior occupational hygienists, and a number have been involved with OHTA since the beginning. All are committed to improving standards of occupational hygiene around the world. 

You can often meet them in person at national and international hygiene conferences and they all welcome the chance to talk more about OHTA.

Individuals on the Board derive no personal financial benefit from their involvement.

Mrs Nancy McClellan MPH, CIH, CHMM

Nancy McClellan has invested over 27 years in practising occupational hygiene in a wide variety of high hazard industries throughout the USA. Prior to working as a consultant, Nancy was Global/Group Industrial Hygiene Manager of LafargeHolcim, and, before that, Occupational Hygiene Manager at AbbVie Biopharmaceutical. A past director and committee chair for the American Board of Industrial Hygiene (ABIH) Board of Directors, Nancy is also a member of the British and Irish Occupational Hygiene Societies and has recently been elected to the American Industrial Hygiene Association (AIHA) Board of Directors. A member of the OHTA Leadership Group since 2007, Nancy is now joint Chair of the Board of Trustees of OHTA.


Ms Chris Laszcz-Davis MS, CIH, FAIHA, REPA, AIC Fellow 

As President of The Environmental Quality Organization (EQO) LLC and former Corporate Vice-President, EH&S, Operational Integrity and Product Stewardship, Kaiser Aluminum & Chemical Corporation, Chris has over 35 years of executive management, professional, operational, technical and consulting experience in occupational safety & health, environmental affairs, operational integrity, risk management, product stewardship/quality, strategic planning, auditing, and corporate acquisitions/ divestitures in industry and government. Prior to working for industry, Chris worked for the US Department of Energy (DOE) as a regional Manager.

Chris is an American Industrial Hygiene Association (AIHA) Fellow, an American Institute of Chemists (AIC) Fellow, and a recipient of several awards including national AIHA’s Kusnetz and Alice Hamilton awards. As Past President, American Academy of Industrial Hygiene (AIH), Chris was instrumental in having the profession sponsor its first major Conference on Risk Assessment in the early 1990’s. Chris has served on numerous boards including the American Conference of Governmental Industrial Hygienists (ACGIH) and AIHA, as well as being a Trustee for both the American Board of Industrial Hygiene (ABIH) and the American Industrial Hygiene Foundation (AIHF). When with ABIH, she served as ABIH’s delegate to the IOHA National Accreditation Recognition (NAR) Committee. She is a 2017 member of NIOSH’s Board of Scientific Counselors (BSC), and Past-President/ongoing Board member of California Industrial Hygiene Council (CIHC), an EH&S legislative advocacy group. Chris was also recently appointed to California’s Health & Safety Standards Board by Governor Edmund Brown. Chris is a member of the American Industrial Hygiene Association (AIHA), the British Occupational Hygiene Society (BOHS) and the Australian Institute of Occupational Hygienists (AIOH). Chris is joint Chair of the Board of Trustees of OHTA.



Dr Ross Di Corleto COH

Ross Di Corleto has been involved in occupational health & safety and occupational hygiene for 35 years with experience in the power industry, mining and refining, nationally within Australia and internationally. He has a Bachelor of Applied Science, Post Graduate Diploma in Occupational Hygiene, a Master of Science by research, and a PhD in occupational health and is Adjunct Associate Professor, University of Queensland.

He is a certified hygienist, a Fellow & Past President of the Australian Institute of Occupational Hygienists and recipient of the AIOH Pamela De Silva Award and a Fellow of the Safety Institute of Australia.

He has been involved in the development and presentation of undergraduate and post graduate modules in occupational health and has lectured at a number of Australian Universities. Ross is currently the Principal Adviser (Global) - Health Risk, for the Rio Tinto resources group based in Brisbane.

Dr Thomas P Fuller, ScD, CIH, CSP, MSPH, MBA

Dr Fuller has over 35 years of experience in occupational safety, industrial hygiene, infection control, environmental management, and public health. He is the American Industrial Hygiene Association (AIHA) representative on the International Occupational Hygiene Association (IOHA) Board and Past Chair of the AIHA International Affairs Committee. Committed to improving occupational hygiene education and training, he is Associate Professor at Illinois State University, and also teaches OHTA courses on behalf of Workplace Health Without Borders (WHWB). Dr Fuller also fulfils the role of interim IOHA representative to the OHTA Board.


Mrs Sarah Leeson MSc DipOH MFOH 

Sarah Leeson has over 25 years experience in Occupational Hygiene, the majority of which has been in the Petrochemical Industry working for ExxonMobil. Sarah is currently the Occupational Hygiene Manager for the Europe, Africa and Middle East region and is based in the UK. One of her roles is to support and encourage employees to progress their Occupational Hygiene training and development. An active Member of BOHS and also a member of the Faculty Board, Sarah joined the OHTA Board in August 2016.


Mr Alan Leibowitz CIH, CSP

Alan Leibowitz is President of EHS Systems Solutions, a consultancy solving leadership and management systems challenges. He previously led ITT’s global EHS and Security program. In this role he directed all program elements including industrial hygiene, business continuity, product safety, auditing and environmental remediation. He is an AIHA Fellow and leader in management systems who led the development of ANSI Z10. He served on the Board of Directors of AIHA, NAEM, RAB and the Center for Safety and Health Sustainability (CSHS). He chaired EHS councils for the Electronic Industries Alliance (EIA), Aerospace Industries Association (AIA) and was a Liaison Delegate to the WBCSD.


Dr Zack Mansdorf, CIH, CSP, QEP, FAIHA

Dr Mansdorf is a distinguished occupational hygienist with a background in insurance, academia, consulting and industry. He is a former senior vice president of L’Oreal with considerable international experience. He is a former president of AIHA and has served on the governing bodies of many US IH/OH and safety organisations. 


Ms Lynn O'Donnell CIH, FAIHA

Lynn O'Donnell received degrees in Nursing, Industrial Hygiene and Management from the University of Virginia, University of Michigan and Aquinas College. From 1977–1990, she worked for the Michigan Department of Public Health, Division of Occupational Health in the areas of compliance, consulting, training and education and health standards promulgation. O’Donnell was certified by ABIH in Comprehensive Practice in 1981 and also received the Bloomfield award from ACGIH that year. She is a Fellow Member of AIHA, served as ABIH Director 1983-1989; Academy Councilor 1986-1988; AIHA Director 1989-1992 and Executive Director of the American Board of Industrial Hygiene from January 1991-June 2014. In 2010, O’Donnell received the AIHA Alice Hamilton Award and was the recipient of the first ABIH Lynn C. O’Donnell Lifetime Achievement Award in 2014. 


Mr David O'Malley DipOH CFFOH

David O'Malley has worked as an Occupational Hygienist for 39 years, both in multinational industry and in consultancy. He has held the BOHS Diploma of Professional Competence in Occupational Hygiene since 1985. A former president of BOHS, he is a Fellow of the Faculty of Occupational Hygiene, and acted as Registrar of the Faculty from 2003 until 2011. David has been involved in OHTA since its inception. He chaired the OHTA Qualifications Group, which developed the examinations system, and was a member of the OHTA Leadership Group until April 2015. David has acted as an Approved Training Provider [ATP] for OHTA courses, teaching in Saudi Arabia, Qatar and South Africa. In January 2016 David became the first Chair of the OHTA Advisory Committee, and in that capacity also rejoined the OHTA Board. 


Mr Noel Tresider AM, COH,
CIH 1984-2017

Noel Tresider is a Fellow of the Australian Institute of Occupational Hygienists (AIOH) with over 35 years' experience as a hygienist. He served on the IOHA Board for eight years and was IOHA President 2011 - 2012. He was Chair of the IOHA National Accreditation Recognition (NAR) Committee for six years and has an understanding of certification schemes around the world. He was recently awarded Member (AM) in the General Division of the Order of Australia, for significant service to workplace health in the field of occupational hygiene, and to the promotion and development of standards and training. He has also received the IOHA 2014 Lifetime Achievement Award and the AIHA 2015 Yant Award. A keen advocate of OHlearning, he has been involved with OHTA since its inception and has written the draft Oil & Gas Module (2014) (Advanced).  


 

Mr Steven Verpaele, MSc

Mr Verpaele currently works as manager Industrial Hygiene at the Nickel Institute and had senior roles at Mensura and the University College of Ghent. He is founder and president of the Belgian Centre for Occupational Hygiene (BeCOH), board member of the Belgian Society for Occupational Hygiene (BSOH), extraordinary member of the Belgian High Council for Prevention and Protection at Work and the Belgian representative in the EU OH platform. With a Master’s degree in Environmental Chemistry – Industrial Hygiene, he has more than 10 years’ experience as an expert in different ISO and CEN workgroups, with primary focus on workplace atmospheres.


Lab bench work

Lab bench work

Using solvent to wash a chemical under vacuum filtration on the laboratory bench

The Board

  • Nancy McClellan
  • Chris Laszcz-Davis
  • Ross Di Corleto 
  • Thomas P Fuller
  • Sarah Leeson
  • Alan Leibowitz
  • Zack Mansdorf 
  • Lynn O'Donnell
  • David O'Malley
  • Noel Tresider AM 
  • Steven Verpaele