Technical Staff

DGAC's Technical Staff provides members with an opportunity to find answers to dangerous goods transport related questions.  If you have specific questions about the regulations, our Technical Staff is here to help you out.  Our experts are here to make suggestions, provide advice, and offer guidance that helps you make the correct decision in moving your hazardous materials. 

Meet the Technical Team!

Vaughn Arthur, DGAC President

Vaughn joined the DGAC staff in 1989 to provide administrative support for the training programs. DGAC staff was restructured in the early 1990s and Vaughn was named to the position of Director of Education and Training. He became DGAC’s principal classroom instructor in 1994 and took the helm as President in December of 2011.

Vaughn is a certified Dangerous Goods Safety Advisor (DGSA), has published articles in trade publications, and has contributed to course textbooks on hazardous materials transportation. In addition to training courses and conference presentations, he has been an invited lecturer at the International Maritime Academy in Trieste, Italy and at PIRA, International in the UK.  He and his family reside near Washington, DC.

Vaughn is well known as a trainer in the industry and has been teaching dangerous goods professionals how to properly use the regulatory texts for over two decades.  As those of you who have had him as a trainer know, he is very knowledgable when it comes to the IATA DGR, 49 CFR, and IMDG Code. 

His ability to explain the regulations to both new Dangerous Goods professionals and seasoned veterans has been honed over his many years in the classroom.

Delmer Billings, Technical Director

  • Delmer (Del) Billings joined DGAC early in 2014 as the Interim Technical Director. 

  • Del is an expert in dealing with questions related to the 49 CFR (HMR - Hazardous Materials Regulations).
  • Prior to joining DGAC, Del served in several capacities during his more than 35 years of service with the Department of Transportation, both with PHMSA (Pipeline and Hazardous Materials Safety Administration) and the Office of Motor Carrier Safety. 

Del retired from the U.S. DOT, Pipeline and Hazardous Materials Safety Administration’s Office of Hazardous Materials Safety where he served as the Senior Regulatory Advisor, Standards and Rulemaking Division. Del was responsible for directing and mentoring rulemaking actions to incorporate special permits and approvals into the Hazardous Materials Regulations and well as generally managing other regulatory issues and various special projects.

 Mike Morrissette, Technical Adviser

Mike Morrissette
Mike Morrissette joined the Dangerous Goods Advisory Council in 1995 as Technical Director and was elected President in 2005. He retired as President in 2011, but has remained on staff as a Technical Adviser.

Prior to joining DGAC, Mike has spent 25 years with the U.S. Coast Guard in various positions involving regulations development for the mirtime transport of dangerous goods.  During his tenure with the Coast Guard, he served as Vice Chairman of the IMO's Bulk Liquids and Gases Sub-Committee. Mike still actively participates as a DGAC delegate to various IMO meetings.

If you have questions related to IMO (e.g., about the IMDG Code or bulk vessel transportation), Mike Morrissette is your guy.

Andy Altemos, Staff Associate

Edward A. Altemos has held key positions in the hazardous materials regulations development field with the U.S. Coast Guard, U.S. Department of Transportation (DOT), and at the international level. At DOT he was responsible for all activities relating to the development of international hazardous materials transport requirements in all modes of transport. He represented the United States before various international organizations involved in the development of such regulations, including the United Nations, the International Maritime Organization (IMO), and the International Civil Aviation Organization (ICAO). He provided guidance to shippers and carriers on domestic and international hazardous materials transport requirements. Immediately prior to entering the private sector, Mr. Altemos was employed by ICAO, a specialized agency of the United Nations, where he was responsible for world-wide implementation of international regulations governing the transport of hazardous materials in aircraft.

Geoff Leach, Staff Associate

Geoff Leach

Geoff Leach joined the United Kingdom Civil Aviation Authority (CAA) in 1982, and joined the Dangerous Goods Office in 1990.  In May 2002 he was appointed Head of the Dangerous Goods Office, also becoming the United Kingdom member of the ICAO Dangerous Goods Panel (DGP), having attended all working group and Panel meetings since 1993 in the capacity of advisor. In November 2007 he was elected Chairman of the DGP, and also Chairman of the Dangerous Goods European Liaison Group, an informal body of European authorities and operators; he has also chaired the 6 IATA lithium battery workshops held to date.  He was also an adviser to the United Kingdom expert at the United Nations Sub-Committee of Experts on the Transport of Dangerous Goods.  In 2013, he left the CAA to form the Dangerous Goods Office Limited, offering training and consultancy to industry and regulators worldwide.  He continues to attend all ICAO DGP meetings on behalf of the Dangerous Goods Advisory Council.
In 2016 Geoff received DGAC's George L. Wilson Award, considered the highest form of recognition for an individual based on a lifetime of achievement in advancing the cause of safety in the transport of dangerous goods.

Jeff Hart, Staff Associate

Jeff Hart


Jeff Hart retired in 2015 after 38 years public service with the United Kingdom Department for Transport (DfT) following an entirely undistinguished academic career studying history and politics! He has worked in the international arena for most of his career, firstly as part of the UK delegations to the International Maritime Organization’s (IMO) Assembly, Council, Facilitation and Technical Cooperation Committees and then with the European Civil Aviation Conference in the field of passenger fare liberalisation and cargo operations. He joined DfT’s Dangerous Goods Division in 1990 and became the Head of Division in 1996. Jeff then led the UK delegations to the UN Sub-Committee of Experts on the Transport of Dangerous Goods, the RID/ADR/ADN Joint Committee, ADR WP.15 and various other international dangerous goods meetings such as the European Union, OECD and the UN GHS Sub-Committee. With multi-modal dangerous goods transport responsibilities, he was also part of the UK delegation to IMO and International Civil Aviation Organization meetings. Following 9/11.

Jeff played a leading role in introducing international security provisions within the dangerous goods safety regulations. He was responsible for enacting UK national legislation for the safe transport of dangerous goods by road and rail and acted as the UK competent authority for international road and rail dangerous goods transport. Jeff was privileged to be elected as Chairman of the UN Sub-Committee of Experts on Transport of Dangerous Goods at the end of 2010 until his retirement. Since then he has spoken at a number of conferences and events but only when he feels like it! He currently provides advice to the Dangerous Goods Advisory Council on issues relating to the IMDG Code. Jeff was appointed an Officer of the Order of the British Empire (OBE) by Her Majesty Queen Elizabeth II in the 2016 New Years’ Honours List for services to transport