1. The use of the Woodman Lateralization Procedure of bilateral vocal cord paralysis, Johannesburg Hospital, Weekly Surgery Meeting, February 1979.

2. The Interpretation of CT scans of the Larynx Correlated with pathology, British ORL Research Society, Bristol, England, April 1980.

3. Poster exhibition of examination of the larynx by a new method, combined meeting of the Dutch and British Pathology Societies, Groningen, The Netherlands, May 1980.

4. Pharyngo cutaneous fistula following laryngectomy, Toronto General Hospital, ENT grand rounds, July 1980.

5. CT of the larynx, 3rd National ORL Congress, Durban October 1981.

6. The use of the Pectoralis Major Myocutaneous Flap for Reconstruction in Head and Neck Surgery. 3rd National ORL Congress, Durban, October 1981.

7. The Surgical Management of Laryngo Tracheal Trauma, Johannesburg Hospital, weekly surgery meeting, April 1982.

8. Recent advances in Head and Neck Surgery, Oncology Society Meeting, Department of Surgery, Johannesburg, March 1982.

9. Hyponatraemia Secondary to Olfactory Neuroblastoma, Meeting of the American Society for Head and Neck Surgery, Palm Beach, Florida, USA, May 1982.

10. Pre operative Adjuvant Chemotherapy and Radiotherapy preliminary results, 4th National ORL Congress, Sun City, October 1983.

11. Respiratory Function in Post laryngectomy Patients, related to stoma size, 4th National ORL Congress, Sun City, October 1983.

12. The Versatility of the Pectoralis Major Myocutaneous Flap, 4th National ORL Congress, Sun City, October 1983.

13. The Cranio Facial Approach to the Mid facial Sinuses. 4th National ORL Congress, Sun City, October 1983.

14. Plasmacytomas of the Head and Neck, 4th ORL Congress Sun City, October 1983.

15. The use of the Trapezius Osteomyocutaneous Flap for the Reconstruction of the Anterior Mandible. The American Academy of Facial Plastic and Reconstructive Surgery. Palm Beach, Florida, USA, May 1984.

16. Videotape production of Trapezius Osteomyocutaneous Flap; meeting of Society of Head and Neck Surgeons, Grand Hyatt Hotel, New York, May 1984.

17. Videotape production: Radical and Functional Neck Dissection. Shown at ENT departmental meeting, University of Toronto, Toronto, Ontario, Canada. May 1984.

18. The use of the Pectoralis Major Myocutaneous Flap in South Africa, combined Head & Neck Surgery Meeting, Baltimore, Maryland, USA. June, 1984. Presentation read by C. Joseph, and poster exhibition.

19. Tracheostomy. Presentation to surgical meeting (By invitation) Hillbrow Hospital, November 1984.

20. Intubation Injury. Presentation to ICU Group, JG Strijdom Hospital, Auckland Park, Johannesburg. April, 1985 (by invitation).

21. Videotape Productions: Laryngectomy. (1985)

22. Manubrial Resection for Stomal Recurrence. 5th SA National ORL Congress, Cape Town, Oct. 14 19, 1985.

23. The use of the CO2: Laser in dealing with Fibrous Strictures of the Upper Airways due to Caustic Ingestion. 5th SA National ORL Congress, Cape Town, Oct. 14 19, 1985.

24. The role of the Functional Neck Dissection in dealing with Advanced Tumours of upper Aero digestive tract. Read by C. Joseph. 5th National ORL Congress, Cape Town, Oct. 14 19, 1985.

25. Video presentation of functional neck dissection. 5th SA National ORL Congress, Cape Town, Oct. 14 19, 1985.

26. Poster exhibition of Alkaline Phosphatase production in Laryngeal Carcinomas. SA Society of Pathologists, Cape Town, July, 1986.

27. Framework invasion in Laryngeal Cancer, Inaugural meeting of The South African Society of Head and Neck Oncology, Durban, Oct. 1986.

28. Framework Invasion in Laryngeal Cancer, Joint meeting of Society of Head and Neck Surgeons, Society of Surgical Oncology and British Counterparts, London, April 27 30, 1987.

29. Laser Surgery in Laryngotracheal Injury and Stenosis, ENT Alumni Meeting, Toronto, May 6 8, 1987.

30. Workshop in Laser Surgery, Co presenter, July 1987, Durban, South Africa, Westville Hospital.

31. Open Rhinoplasty 5th National ENT Meeting, Pretoria, October 1987.

32. Pre epiglottic Space Revisited Is it significant? 5th National ENT Meeting, Pretoria, October 1987.

33. Pre epiglottic Space Revisited Is it Significant? 2nd International Conference on Head & Neck Cancer, July 31 August 5, Boston, Mass., USA.

34. Ventriculo Saccular Carcinoma 3rd National Meeting, SA Head & Neck Oncology Society, October 21, Cape Town.

35. Laser arytenoidectomy for bilateral Vocal Cord paralysis 7th National ENT Congress, Thaba' Nchu, OFS October 1989.

36. ENT Problems in Scuba Diving, Divemed '90 Congress, Johannesburg, February 3rd, 1990.

37. Poster exhibition IX Pulmonology Congress, Sun City. March 5th, 1990 : Laser Arytenoidectomy.

38. ENT Problems in Scuba Diving, 1st Meeting of PAFOS, (Pan Africanist Federation of Otolaryngological Societies) Harare, Zimbabwe, March 3, 1991.

39. The Open Rhinoplasty: Instructional session of the 8th British Academic Conference in Otolaryngology. Dublin, Ireland, 1991.

40. Poster Exhibition: Laser arytenoidectomy, and video presentations of Trapezius Osteomyocutaneous Flap and Functional and Radical Neck Dissection, 8th British Academic Conference in Otolaryngology. Dublin, Ireland, 1991.

41. 1st International Symposium on Laryngo Tracheal Reconstruction, Cleveland, Ohio, USA. Aug. 22, 1991. The value of the Flow Volume Loop in evaluating the results of treatment in the upper airway obstruction.

42. Visiting lecturer, Dept. ORL, Free University Hospital Amsterdam, The Netherlands, Feb. 10 14 1992. Local spread of Cancer within the Larynx.

43. Invited speaker, ENT update, UCT Medical School, Cape Town. Open Rhinoplasty, and the use of the flow-volume loop in assessment of laryngotracheal obstruction. 20 & 21 March, 1992.

44. Surgeon's Week, The Netherlands Cancer Institute, Amsterdam. Neck Node Metastasis from Unknown Primary; Neck Dissection, radical, modified and selective. March 1993.

45. Invited Speaker, Dept ORL, Erasmus University, Rotterdam, The Netherlands. April, 1993."ENT HEAD and NECK SURGERY in South Africa."

46. Invited Speaker, The Dept ORL/Head and Neck Surgery, The University of Tennessee, Memphis, USA, April 1993. "Experience with the Open Rhinoplasty."

47. Visiting Lecturer, Dept of Otolaryngology/Head and Neck surgery, University of Arkansas Medical College, Oct. 1993. "Speech rehabilitation in the laryngectomee using the PROVOXTM voice prosthesis" and "Framework invasion in Laryngeal Cancer."

48. By invitation, Academic Faculty of the Second World Congress on Laryngeal Cancer, Sydney, Australia, Feb. 20-26, 1994. Panellist, Symposium on Advanced Laryngeal Cancer: "Spread of Disease, and framework invasion" Co-chairman, workshop on "Barriers to tumour spread", presentation on the anatomic barriers to tumour.

49. Visiting Lecturer, Dept of Otolaryngology, The Chinese University of Hong Kong, Feb. 26 to March 1, 1994. The PROVOX voice prosthesis and speech rehabilitation: (1) Background and development. (2) Clinical application and "trouble-shooting".

50. Invited Speaker, The combined symposium of the Faculty of ORL, College of Surgeons of Hong Kong, and the Hong Kong Otorhinolaryngological Society. "Speech rehabilitation after resection of Laryngopharyngeal cancers related to method of reconstruction."

51. By invitation, The combined meeting of the SHNS and the EORTC, Paris, France; May 25-28, 1994. Panel on early laryngeal cancer. Presentation on "Supraglottic laryngectomy, the history, pathological basis, and the results of supraglottic laryngectomy and radiation at the Netherlands Cancer Institute."

52. By invitation, The East Anglian ENT Summer Meeting, Colchester, Essex, England. June 3rd, 1994. "Speech rehabilitation in the laryngectomee; History, and the use of indwelling prostheses especially the PROVOX prosthesis."

53. Member of the Faculty, Bimonthly PROVOX voice rehabilitation course, The Netherlands Cancer Institute. 1994.

54. Visiting Professor, Dept. Otolaryngology, The University of Mainz, Mainz, Germany, 9-11 October, 1994. "Experience with voice rehabilitation in the laryngectomee using indwelling voice prostheses."

55. Nederlandse Vereniging voor Keel-Neus-Oorheelkunde (Dutch ENT Society) meeting, AMC Amsterdam, Friday 4th November, 1994. "Lokale controle en complicaties na radiotherapie voor het vroege larynxcarcinoom". Poster and Presentation.

56. Nederlandse Vereniging voor Keel-Neus-Oorheelkunde, Schrijveningen. Friday 27th Jan, 1995. "Behandeling van Halskliermetastasen in het Supraglottish Larynxcarcinoom."
Poster: "Weke delen sarcomen van het hoofd-hals gebied geassocieerd met chirurgisch trauma" Dijkstra, M. et al.

57. Sisson International Head and Neck Workshop, Vail Colorado. Feb. 11-18, 1995. Member of the faculty. Panel, controversies in the treatment of glottic and Supraglottic carcinomas.

58. Management of cervical metastases in supraglottic cancer. American Laryngologic Association, Palm Desert, Ca April 29, 1995. Read by FJM Hilgers.

59. Dutch ENT meeting, Groningen, The Netherlands, 12-13 May, 1995: De waarde van 201Thallium SPECT scans voor de diagnostiek van hoofd-halstumoren. Poster: Behandeling van chyluslekkage na halsklierdissectie, De Gier et al.

60. American Academy of Otolaryngology, New Orleans, Louisiana, USA, September, 1995. Voice rehabilitation after Laryngectomy - course with FJM Hilgers.

61. South African Head and Neck Oncology Society, Oct. 27, 1995. The Value of SPECT scanning with 201Thallium in Head and Neck Cancer.

62. South African ENT Society, November 6-8, 1995. The Management of Neck Metastases in Supraglottic Cancer.

63. Sisson International Head and Neck Workshop, Vail Co. Feb., 1996. Panel on Laryngotracheal Injury.

64. The 4th International Conference on Head and Neck Cancer, July 29- Aug. 2, 1996. Toronto, Canada. The value of SPECT scanning with Tl-201 in Head and Neck Cancer.

65. American Academy of ORL-HNS, Washington, D.C. Sept. 26 - Oct. 2 1996. Course on post operative speech rehabilitation after laryngectomy.
 

66. IFOS World Congress on Otorhinolaryngology Head and Neck Surgery, Sydney, Australia, March 2-7, 1997. Management of Chyle leaks after Neck Dissection.
 

67. International Workshop, July 19, 1997. Göttingen, Germany. Management of tumours of the external auditory canal - benign and malignant.
 

68. First Meeting of the International Federation of Head and Neck Oncologic Societies: The Asia Pacific Congress, Mumbai, India; December 11-14, 1997.Moderator of Panel: Imaging modalities - contribution to management of head and neck cancer. Presentations: (1) The use of US-FNA in assessing neck metastases (2) US for local spread in laryngeal and hypopharyngeal lesions.
 

69. 20th Sisson International Head and Neck Workshop, 8th-14th Feb., 1998. Panel on Neck Dissection and panel on Laryngology; simple problems- tough solutions.
 

70. The management of supraglottic cancer. ’98 International and 5th National Head and Neck Cancer Congress, Beijing, China. 11 June 1998.
 

71. Intra-laryngeal spread of cancer and the impact on therapy. ’98 International and 5th National Head and Neck Cancer Congress, Beijing, China. 11 June 1998.
 

72. Advances in imaging of Head and Neck Tumours. ’98 International and 5th National Head and Neck Cancer Congress, Beijing, China. 11 June 1998.
 

73. The assessment of cervical metastases by means of SPECT scanning with Thallium- 201, and Ultrasound (US) Fine Needle Aspiration Cytology (FNA) Meeting of the State Surgical Society, Queensland, Gold Coast, Queensland, Australia. August 1998.
 

74. Ultrasound (US) in the evaluation of local spread of cancer of the larynx and Hypopharynx. The Second International Symposium in Israel on Head and Neck Surgery and Oncology. Jerusalem, Israel. . Nov. 1-5. 1998.
 

75. Pharyngeal plexus neurectomy versus non-closure of the constrictor muscles: comparison of post laryngectomy complications and quality of voice and speech using the PROVOX voice prosthesis. The Second International Symposium in Israel on Head and Neck Surgery and Oncology. Jerusalem, Israel. . Nov. 1-5. 1998.
 

76. Spread of cancer in the Larynx and its clinical importance. . The Second International Symposium in Israel on Head and Neck Surgery and Oncology. Jerusalem, Israel. . Nov. 1-5. 1998.
 

77. Moderator of panel: The role of microsurgery in early Laryngeal Cancer. . The Second International Symposium in Israel on Head and Neck Surgery and Oncology. Jerusalem, Israel. . Nov. 1-5. 1998.
 

78. The value of SPECT scanning with Thallium-201 for assisting in the assessment of head and neck cancer. . The Second International Symposium in Israel on Head and Neck Surgery and Oncology. Jerusalem, Israel. . Nov. 1-5. 1998.
 

79. Ultrasound-Guided Fine Needle Aspiration for the assessment of cervical metastases. Knappe M, Louw M, Gregor RT. The Combined Otolaryngological Spring Meetings, Palm Desert, California. April 26, 1999.
 

80. Vermaak DB*, Gregor RT & Ellmann A. The value of SPECT scanning with Thallium-201 in identifying occult primaries and recurrence in head and neck cancer. Annual meeting of the SA Society of ORL H&N Surgery. Bloemfontein, October 25-29, 1999.
 

81. Attwood R*, Louw W & Gregor RT, Otogenic Lateral sinus Thrombosis and the empty delta sign. Annual meeting of the SA Society of ORL H&N Surgery. Bloemfontein, October 25-29, 1999
 

82. Vlantis* L, Elliot H, Oudes M & Gregor RT. Conversion of Speech rehabilitation from non-indwelling to PROVOX-2 indwelling voice prostheses – comparison of patient preference and voice quality. Annual meeting of the SA Society of ORL H&N Surgery. Bloemfontein, October 25-29, 1999.
 

83. Gregor RT*, Member of Faculty; The Sisson International Head and Neck Workshop, Vail Colorado. Jan 29 –Feb 4, 2000. Panels on parotid disease and laryngeal cancer.
 

84. Gregor RT*, International representative, 5th International Conference on Head and Neck Cancer, San Francisco, Calif. USA. July 29-August 2, 2000. (Also moderator of session, and panellist: The N+ Neck)
 

85. Gregor RT*, “Lunch with the Professors session” with A Ahuja and A van Hasselt: The value of ultrasound in the Head and Neck. 5th International Conference on Head and Neck Cancer, San Francisco, Calif. USA. July 29-August 2, 2000.
 

86. Vermaak DB*, Gregor RT, Vlantis A & Ellmann A: The value of SPECT scanning with thallium-201 in head and neck cancer. 5th International Conference on Head and Neck Cancer, San Francisco, Calif. USA. July 29-August 2, 2000.
 

87. Gregor RT*, with Ahuja A and van Hasselt A: The value of US in the head and neck, Instructional course, The American Academy of ORL, Washington DC. 24-27 September, 2000
 

88. Gregor RT, The use of Mitomycin C for the reduction of fibrosis after surgery for Laryngotracheal Stenosis – A preliminary report. The meeting of the SA Society of ORL-H&N Surgery. Sun City. Oct30-Nov1, 2000.
 

89. Gregor RT, The value of Mitomycin C for the reduction of fibrosis after surgery for Laryngotracheal Stenosis NZ Society of Otolaryngology Head & Neck Surgery, Hanmer Springs, 6-8 Nov 2001.
 

90. Gregor RT, RJE Pennings, FJ Vernimmen. Transoral Laser Microsurgery for Laryngeal and Hypopharyngeal Cancer. NZ Society of Otolaryngology Head & Neck Surgery, Hanmer Springs, 6-8 Nov 2001.
 

91. Gregor RT, RJE Pennings, FJ Vernimmen. Transoral Laser Microsurgery for Laryngeal and Hypopharyngeal Cancer. The Australian Society of Otolaryngology Head and Neck Surgery. The 2nd Trinational ORL Conference. Perth WA. 10-11 March, 2001.
 

92. Gregor RT, Vlantis AC, Elliot H, & Oudes M. Conversion of Speech Rehabilitation from Non-Indwelling to Provox-2 indwelling voice prosthesis – comparison of patient preference and voice quality. The Australian Society of Otolaryngology Head and Neck Surgery. The 2nd Trinational ORL Conference. Perth WA. 10-11 March, 2001.
 

93. Gregor RT, The management of the facial nerve in tumours of the external auditory canal including malignant parotid lesions, The New Zealand Society of ORL Head and Neck Surgery. October 2002.
 

94. Gregor RT, RADPLAT: The Waikato Experience. NZIMRT Annual Conference, Novotel, Hamilton, New Zealand. 16th August, 2003
 

95. Gregor RT, The management of the facial nerve in tumours of the skin, pinna and parotid gland. 3rd Practical Otology/neurotology Update. Niagara, Ontario, Canada, Saturday, October 25th 2003.
 

96. Gregor RT, The value of ultrasound in the head and neck. 59th annual meeting of the NZ Society of ORL/Head&Neck Surgery. Hyatt Hotel, Auckland. 3-6 November, 2004
 

97. Gregor RT; The management of tumours of the external auditory canal, pinna and surrounding skin. 6th Annual meeting of the Australian and NZ Head and Neck Society, Stanford Grand, Adelaide, 11-13 November 2004
 

98. Gregor RT; The management of the laryngectomy stoma in relation to prosthetic voice rehabilitation. 6th Annual meeting of the Australian and NZ Head and Neck Society, Stanford Grand, Adelaide, 11-13 November 2004
 

99. Gregor RT; “Parapharyngeal tumours”, “Chylous leak after neck dissection”. Upover downunder ENT Meeting, Campitello, Italy, 5-11 Feb 2005. Chair, Larynx panel discussion, presentations:
 

100. Gregor RT; “Cancer of the Hypopharynx”, “Cancer of the glottis”, and “Adjuvant radio(chemo)therapy”. –by invitation.Laser Surgery for Head and Neck Tumours – Reflections from 5 Continents. June 10-June11th 2005. Department of ORL, University of Göttingen, Germany.
 

101. Panels on H&N, Laryngology & Neck disease. Upover downunder ENT Meeting, Campitello, Italy, 28th Jan-4th Feb, 2006.
 

102. Gregor RT: Invited Guest: “Parotid surgery and the infratemporal fossa approach”, “Radical Neck Dissection”, “Total Laryngectomy”, “Pharyngolaryngectomy”. Cadaver Dissection Course in H&N Surgery. 22nd-23rd July, 2006. Brisbane (University of Queensland and Princess Alexandra Hospital).
 

103. Gregor RT: Member of the faculty, by invitation. Panel: “Choosing a Chemoradiation Protocol”.The International Workshop on Intra-arterial Chemotherapy for Head and Neck Cancer, Southern Illinois University, Springfield Illinois. August 20-22, 2006.
 

104. Gregor RT; (Invited Key Note Speaker) “Adult Soft Tissue Sarcomas of the Head and Neck”, & “Surgical Management of Hypopharyngeal Cancers” The Australian and New Zealand Head and Neck Society (8th Annual Meeting) Wellington, NZ, Sept 28-Oct1. 2006

105. May 13 – 15, 2008: RACS Scientific Meeting, Hong Kong. By invitation:

“Management of the facial nerve in parotid surgery – indications for resection”