Position held: Head of Nuclear medicine at the University of the Witwatersrand/Johannesburg and CH-Baragwanath hospital
Clinical head: Nuclear medicine at the Donald Gordon Medical Centre - University of the Witwatersrand
Past chairperson of the Association of South African Nuclear Physicians
Executive member of the DGMC and Wits university credentialing and accreditation board for specialists
Executive member of the management committee of the DGMC- University of the Witwatersrand faculty practice
Vice-president elect of the South African Society of Nuclear Medicine.
Chair of the scientific session on Nuclear Medicine and Cancer in the first National Workshop in Nuclear Medicine at the University college Hospital of Ibadan, Nigeria
International Atomic Energy Agency representative for the commissioning of the first Nuclear Medicine facilities in Nigeria at the University college Hospital, Ibadan.

Membership of professional bodies/ associations
1. Member of the South African Association of Nuclear Physicians
2. Member of the advisory committee to the National Accelerator centre for joint- institution endeavor to extend human resource base in Radiation Medicine
3. Member of the scientific committee to the 2nd Congress of the African Association of Nuclear Physicians and the 39th French Language Nuclear Medicine colloquium, 10-15 November, Reunion Island.
4. Member of the health professional council of South Africa
5. Member of the South African Medical Association
6. Member of the South African Society of Nuclear Medicine
7. Member of the University of the Witwatersrand Convocation
8. Member of the American Association for the Advancement of Science
9. Member of the Medical Protection Society
10. Member of the Society of Nuclear Medicine (SNM)

Thea Eiselen completed her MSc in Medical Sciences at Stellenbosch University in 2004. She is currently employed as a lecturer in Diagnostic as well as Nuclear Medicine subjects at the Cape Peninsula University of Technology. She is responsible for the academic and clinical training of radiography students both pre- and post graduation.

Ronell received her BRad qualification in 1983 and her Honours Degree in Nuclear Medicine in 1990 from UP. She has since worked as a Nuclear Medicine Radiographer in private practices in Pretoria for the past 16 years.

Having completed a Diploma in Tertiary Education 1992 at UP, she became a Tutor at the practice she was working at. Since 1993 to date, she has also been appointed every year as Moderator for Radiopharmacy for the first year students in Nuclear Medicine at the Wits Technicon.

She is currently still employed as a Nuclear Medicine Radiographer in private practice.

Prof Ellmann has been the Head of the department of Nuclear Medicine since August 2001.
Before this she was a senior specialist in Nuclear Medicine in the same department.
Prof Ellmann obtained her qualifications from Stellenbosch University. The title of her MSc thesis was: The excretion of pertechnetate through the stomach of the Chacma baboon.
She has been a member of the Nuclear Medicine department since 1981. Her clinical interests are in Nuclear Cardiology and tumour imaging using Nuclear Medicine techniques.

She is a member of a number of national and international Nuclear Medicine organizations. Presently she is co-opted member of the council of the South African Society of Nuclear Medicine. She serves as a member of the Society of Nuclear Medicine of the USA's International Advisory Group and International Coordinating Committee of the World Federation of Nuclear Medicine and Biology.

She is also the President of the World Federation of Nuclear Medicine and Biology.
Prof Ellmann is involved in several International Atomic Energy Agency (IAEA) activities. She is appointed by the IAEA as an "expert" in Nuclear Medicine. She was the leader of audit teams which visited Nuclear Medicine facilities in Ethiopia, Kenya, Sudan and Ghana. Prof Ellmann also was a member of the teams who compiled South Africa's Country Programme Framework for co-operation with the IAEA (Pretoria, South Africa, 1998), the document on the Harmonisation of Training Standards for Technologists in Africa (Bloemfontein, South Africa, 1999) and the Thematic Health Programme for Africa (Sousse, Tunisia, 2000).

At present she is appointed by the SA Society of Nuclear Medicine as National Project Co-ordinator for Nuclear Medicine for matters of the African Regional Co-operative Agreement (AFRA) project of the IAEA.
Regarding other international activities, she is also appointed as a member of the Editorial Board of the newly formed World Journal of Nuclear Medicine. She serves as the Secretary-General of the African Association of Nuclear Medicine. Prof Ellmann has presented papers at numerous national and international meetings.
She is married to Braham van Zyl. They have three boys, Abrie, Herbie and Johan.