• Languages: Spanish, Portuguese and English
• Specialist in Endodontics, Regional Board of Endodontics (São Paulo, Brazil).
• Ex-Head and Chairman, Department of Restorative Dentistry, Araraquara Dental School – UNESP.
• Ex-Head and Chairman MS and PhD Programs in Endodontics Araraquara Dental School – UNESP.
• Master in Endodontics, University of São Paulo.
• PhD in Pathology, University of São Paulo.
• Visiting Professor, University of Texas – San Antonio, USA.
• Invited Professor, U.I.C.- Universitat Internacional de Catalunya, Spain.
• Vice-President of the Brazilian Society of Endodontics.
• Member of the A.A.E. (American Association of Endodontics)
• The Chief Editor (Endodontist) for “Indian Dentists Research & Review.”
• The Honorary Editor for “World Journal of Dentistry”.

Some further accomplishments include:

• 48 Chapters in Endodontic Books
• 68 Published Articles
• 421 courses lectured in Argentina, Brazil, Uruguay, Paraguay, Bolivia, Colombia, Ecuador, Chile, Peru, Venezuela, Panama, Costa Rica, Dominican Republic, Puerto Rico, Nicaragua, Mexico, United States ,Canada, Portugal, Slovenia, Croatia, Albania, Holland, Poland, Czech Republic, Slovakia, Iceland, Spain, Greece, Italy, Indonesia, Norway, Malaysia, Singapore, Thailand, Sweden, Finland, Serbia, Philippines, Georgia, Moldavia, Lithuania, Estonia ,Latvia, Ukraine, India, Romania, Macedonia, Vietnam, United Emirates, Egypt, China, United Kingdom, Russia,Japan, Denmark and Turkey.
• Professor of Endodontics Specialization Courses and Continuing Education (CE) in USA, Canada, Portugal, Spain and Brazil.

He has authored the following books:

• Leonardo MR, Leonardo RT. Sistemas rotatórios em endodontia. Instrumentos de níquel-titânio. São Paulo: Artes Médicas; 2002. 323 p. (Spanish and Portuguese)
• Leonardo MR, Esberard RM, Bonetti Filho I, Leonardo RT, Tanomaru Filho M. Tratamento de canais radiculares: atualidades técnicas. São Paulo: Editorial Premier; 1996. 169 p. (Portuguese)
• Leonardo MR, Leonardo RT. Endodontics: Technological resources and biological concepts. São Paulo: Artes Médicas; 2011. 650 p. (English, Spanish and Portuguese)

His most important articles include:

• Leonardo MR, Utrilla LS, Rothier A, Leonardo RT, Consolaro A. A comparison of subcutaneous connective tissue responses among three different formulations of gutta-percha used in thermic techniques. Int Endod J. 1990; 23: 211-7.
• Leonardo MR, Silva LAB, Leonardo RT, Utrilla LS, Assed S. Histological evaluation of therapy using a calcium hydroxide dressing for teeth with incompletely formed apices and periapical lesions. J Endod. 1993; 19: 348-52.
• Leonardo MR, Silva LAB, Utrilla LS, Leonardo RT, Consolaro A. Effect of intracanal dressings on repair and apical bridging of teeth with incomplete root formation. Endod Dent Traumatol. 1993; 9: 25-30.
• Leonardo MR, Simões Filho AP, Esberard RM, Bonetti Filho I, Leonardo RT. Safe and easy way to use calcium hydroxide as a temporary dressing. J Endod. 1993; 19: 319-20.
• Bonetti Filho I, Esberard RM, Leonardo RT. Microscopic evaluation of three endodontic files pre and post-instrumentation. J Endod. 1998; 24: 461-4.
• Leonardo RT, Consolaro A, Carlos IZ, Leonardo MR. Evaluation of cell culture cytotoxicity of five root canal sealers. J Endod. 2000; 26: 328-30.
• Soares JA, Leonardo RT. Root canal treatment of three-rooted maxillary first and second premolars – a case report. Int Endod J. 2003; 36: 705-10.
• Perassi FT, Bonetti Filho I, Berbert FLCV, Carlos IZ, Leonardo RT. Secretion of tumor necrosis factor-alpha by mouse peritoneal macrophages in the presence of dental sealers, Sealapex and Endomethasone. J Endod. 2004; 30: 534-7
• Saito D, Leonardo RT, Rodríguez JL, Tsai SM, Höfling JF, Gonçalves RB. Identification of bacteria in endodontic infections by sequence analysis of 16S rDNA clone libraries. J Med Microb. 2006; 55: 101-7.
• Soares JA, Carvalho FB, Pappen FG, Araújo GS, Lima RKP, Rodrigues VM., Leonardo RT. Conservative treatment of patients with periapical lesions associated with extraoral sinus tracts. Aust Endod J. 2007; 33: 131-5.
• Leonardo MR, Silza Herzog FD, Silva FGP, Leonardo RT, Silva LAB. A comparison study of periapical repair in dogs’ teeth using Roekoseal and AH Plus root canal sealers; a histopathological evaluation. J Endod. 2008; 34: 822-5.
• Silva PT, Pappen FG, Souza EM, Dias JE, Bonetti Filho I, Carlos IZ, Leonardo RT. Cytotoxicity Evaluation of four endodontic sealers. Braz Dent J. 2008; 19: 228-31
• Pappen FG, Souza EM, Giardino L, Carlos IZ, Leonardo MR, Leonardo RT. Endodontic chelators induce nitric oxide expression by murine cultured macrophages. J Endod. 2009; 35: 824-8.
• Souza EM, Wu M-K, Van Der Sluis LW, Leonardo RT, Bonetti-Filho I, Wesslink PR. Effect of filling technique and root canal area on the percentage of gutta-percha in laterally compacted root fillings. Int Endod J. 2009; 42: 719-26.
• Câmara AS, Martins RC, Viana AC, Leonardo RT, Buono VT, Bahia MGA. Flexibilily and torsional strength of protaper and protaper universal rotary instruments assessed by mechanical tests. J Endod. 2009; 35: 113-6.
• Faria-Junior NB, Tanomaru-Filho M, Guerreiro-Tanomaru JM, Leonardo RT, Berbert FLCV. Evaluation of ultrasonic and ErCr:YSGG laser retrograde cavity preparation. J Endod. 2009; 35: 741-4
• Drukteinis S, Peciuliene V, Leonardo RT, Pameijer C. In vitro antimicrobial activity of EndoREZ, AH Plus and Roth 801: a case study. Endod Prac. (Forecast for publication – Sept. 2009).
• Pappen FG, Qian W, Aleksej J, Leonardo RT, Leonardo MR, Haapasalo M. Inhibition of sodium hypochlorite antimicrobial activity in the presence of bovine serum albumin. J Endod. 2010; 36:268-71
• Leonardo RT, Tuttle RD, Jent CL, Poulson B, Gordon J, France M, Endo-Eze TiLOS anatomic endodontic technology. Dental Tribune Endo 2009; 4: 3-5
• Leonardo RT, Tuttle RD, Baghoomian I. The Endo-Eze TiLOS System Dentistry. Today.com. Feb. 2010: 74-5
• Leonardo RT, Tuttle RD, ENDO-EZE Tilos Anatomic Endodontic Technology. Oral health. May 2010: 1-5.
• Chávez-Andrade GM,Tanomaru-Filho M,Paulo AO,Leonardo RT,Guerreiro-Tanomaru JM, Plug apical de MTA branco no tratamento endodôntico de dentes permanentes com ápice aberto:relato de 2 casos clínicos. Rev Odontol UNESP,Araraquara, v.39,n.esp,p,32,out.2010.
• Palo RM, Leonardo RT, Iglecias EF. La anatomía radicular y sus implicancias en la instrumentación endodóntica: comprendiendo la Zona V. Canal Abierto. April 2011: 8-11.
• Leonardo MR, Fischer D, Tuttle R, Baghoomian I, Leonardo RT, Endodontic perspective: based on clinical,radiografic,histopathological,and statistical evidence. Endodontic practice US 2011 volume 4 number 3; 20-23.