Natanael Siagian lahir di Tarutung Tapanuli Utara, Sumatera Utara pada 30 Desember 1989. Alumni Universitas Batam jurusan ilmu hukum. Tinggal dan menetap di Jakarta. Email: siagian.natanael@yahoo.com
Akrab disapa Fitri Oshin. WHO Certificate of Achievement on Zoonotic disease-One Health, Antimicrobial resistance, Infodemic Management, Artificial Intelligence for Health, Health Emergency Response, etc. Jurnalis Kesehatan Liputan6.com 2016-2024. Bidang peminatan kebijakan kesehatan mencakup Infectious disease, Health system, One Health dan Global Health Security.