Gülen is a senior legal executive with over 30 years of experience in major international development finance organisations and has led legal functions at the Green Climate Fund, the Global Fund and the Asian Development Bank. She is recognized for her expertise in international development finance, governance, and risk management, and has successfully negotiated high-value agreements and secured critical diplomatic privileges for global institutions. Gülen has built high-performing legal teams, championed ethics and integrity, and shaped policy at the highest levels. Her career includes high level advisory positions with the G20 Global Infrastructure Hub and Qatar Foundation. She holds a Juris Doctor from Dokuz Eylül University (Türkiye) and an LLM from Southern Methodist University (USA).