Dr. dr. Mardjono Tjahjadi, Sp.BS Subsp.N-Vas(K), PhD, FICS is a Neurosurgeon with a subspecialty in Cerebrovascular Surgery. He earned his PhD from Helsinki, Finland.

Commonly known as Dr. Joy, he is also the author of two books titled Aneurisme Otak 1&2.

He specializes in treating various brain conditions, including brain aneurysms (bulging of brain blood vessels), cerebral vascular stenosis (narrowing of brain blood vessels), brain hemorrhages, benign tumors (meningiomas), and brain cancer.

Educational Background

• Faculty of Medicine, Atma Jaya Catholic University of Indonesia, Jakarta
• Neurosurgery Residency – Faculty of Medicine, Padjadjaran University / Hasan Sadikin General Hospital, Bandung
• WFNS Skull Base Surgery Fellowship – Keio University Hospital, Tokyo
• Cerebrovascular Clinical Fellowship – Department of Neurosurgery, Helsinki University Central Hospital, Finland
• Neuro-endovascular / Neurointerventional Clinical and Research Fellowship – Department of Neurosurgery, Seoul National University Bundang Hospital, South Korea
• PhD Program in Clinical Science – University of Helsinki, Finland
• Board-certified Subspecialist in Vascular Neurosurgery, Indonesia
• Board-certified Fellowship in Oncology Neurosurgery, Indonesia

Courses & Training

• The 2023 IFNE Hands-on Workshop on Cerebral, Ventricular, and Skull Neuroendoscopy, Singapore
• Visiting Surgeon (North American Skull Base Society Mentorship Program) – Mayo Clinic, Rochester, MN, USA
• 2nd Aesculap Academy and Faculty of Medicine, Universitas Indonesia Skull Base Cadaver Dissection Workshop
• Bypass 2020 – Anniversary Symposium, Zurich, Switzerland
• LINNC Asia Edition, Singapore
• Introduction to Minimally Disruptive Subcortical Neurosurgery: Concepts of a System Approach, Singapore
• 23rd Annual Scientific Meeting of the Indonesian Neurosurgical Society – Yogyakarta, Indonesia
• 4th Asia-Pacific Microanastomosis Workshop – Seoul National University Bundang Hospital, South Korea
• Radiation Protection and Safety Training – Fatmawati Hospital, Jakarta
• North American Skull Base Society Annual Meeting – Florida, USA
• North American Skull Base Society Cadaver Dissection Course – Florida, USA
• The First ASEAN Neurointervention Conference – Jakarta, Indonesia
• Medtronic Medical Education Program: Pipeline Embolization Device Workshop – Jakarta, Indonesia
• Live Interventional Neuroradiology and Neurosurgery Course – Asia Edition, Singapore
• The 5th WFNS Committee Biennial Conference – Bali, Indonesia
• The 12th Asian Epilepsy Surgery Congress (AESC) – Bali, Indonesia
• Advanced Simulative Training on Neurointerventional Procedures – Universitas Indonesia, Jakarta, Indonesia
• Asia Pacific Stroke Conference 2018 – Jakarta, Indonesia
• Co-Instructor, Neuroendovascular Training Level 1 – Bandung, Indonesia
• Workshop on Pain Management Level 1 – Universitas Sumatera Utara
• Workshop on Carotid Endarterectomy – PIT PERSPEBSI, Balikpapan, Indonesia
• The 12th Lectures and Hands-on Cadaver Dissection Course for Cerebrovascular Microneurosurgery – Taipei, Taiwan
• The 1st Indonesian Advanced Intracranial Neuroendoscopy: Workshop, Symposium, and Live Surgery – Surabaya, Indonesia
• WFNS Comprehensive Surgical Neuroanatomy – 3D Lecture, Karawaci, Indonesia
• Participant in World Skull Base Society Congress 2016 – Osaka, Japan
• Pre-Congress Workshop of World Skull Base 2016 – Osaka, Japan
• The 10th Micro-anastomosis Workshop for Neurosurgeons – Bundang, South Korea
• Participant in World Society of Stereotactic and Functional Neurosurgery Meeting – Mumbai, India
• ICCVS: Workshop in Cerebral Revascularization and Bypass – Siloam Hospital, Karawaci, Indonesia
• Microsurgery of Aneurysms: Recent Advances and Hands-on Workshop – Saint Louis University School of Medicine, St. Louis, USA
• Helsinki Live Course in Microneurosurgery 2014 – Helsinki, Finland
• Barrow Neurological Institute: Workshop in Cerebral Revascularization and Bypass – Phoenix, USA
• International Clinical Researcher – St. Joseph Hospital, Phoenix, USA
• PIT PERSPEBSI Neuroendoscopy Workshop – Solo, Indonesia
• WFNS Workshop: Hands-On Microanastomosis Workshop – Siloam Hospital, Jakarta, Indonesia
• Visiting Neurosurgeon and Clinical Training in Microscopic Lumbar Spine Surgery – Elisabeth Krankenhaus, Osnabrück, Germany
• Clinical Fellowship in Skull Base and Cerebrovascular Surgery – WFNS Foundation, Siloam Hospital / Pelita Harapan University, Indonesia
• Cerebrovascular Surgery Course – Recent Advances in Cerebral Aneurysm Surgery, Jakarta, Indonesia
• Keio University School of Medicine Cadaver Dissection Course – Tokyo, Japan
• Workshop at the 16th Annual Meeting of the Japanese Congress for Brain Tumor Surgery – Yokohama, Japan
• Workshop on Skull Base Dissection – Asian Oceania Skull Base Surgery Meeting, Denpasar, Indonesia
• Workshop on Cadaveric Surgical Approaches to Cervical Spine and Instrumentation Technique – 8th Asian Congress of Neurosurgeon, Kuala Lumpur, Malaysia
• AO Spine Basic Workshop – Jakarta, Indonesia
• Workshop on Microsurgical Approaches to Intrinsic Brain Tumors – Saint Louis University School of Medicine, St. Louis, USA
• Rhoton Surgical Microneuroanatomy Course – AANS Meeting, Philadelphia, USA
• Course in Pediatric Neurosurgery – International Society of Pediatric Neurosurgery, Jakarta, Indonesia
• Cranio-Cervical Junction Approach – Cadaver Dissection, Indonesian Neurosurgical Society Annual Meeting, Semarang, Indonesia
• Total Nutrition Therapy Course – Bandung, Indonesia
• Royal College of Surgeons of England – Introduction to Safe Surgical Skills Course, Bali, Indonesia
• Advanced Trauma Life Support Course – Semarang, Indonesia