Gustavo Nader Marta is a doctor who specializes in radiotherapy, radiosurgery, and stereotactic radiotherapy. He earned his PhD and post-doctorate in Sciences (Oncology Program) from the Faculty of Medicine of the University of São Paulo (FMUSP). He is a full member of the Brazilian Society of Radiotherapy and the American Society for Radiation Oncology (ASTRO), where he serves as a representative on the International Scientific Committee. He is also an associate member of the European Society for Radiotherapy and Oncology (ESTRO) and president of the Society for Neuro Oncology Latin America (SNOLA). Currently, he is a senior physician at the Radiotherapy Service at Hospital Sírio-Libanês in São Paulo. He is the Vice-President of the Brazilian Society of Radiotherapy and a Permanent Professor of the Postgraduate Program (master's and doctorate) in Oncology at the Teaching and Research Institute of Hospital Sírio-Libanês. Gustavo has special interests in the areas of neuro-oncology, breast cancer, head and neck cancer, bone metastasis, and palliative care. Additionally, he is involved in the treatment of functional radiosurgery for trigeminal neuralgia, movement disorders, epilepsy, behavior, and mood disorders.