Since 1998, Irwan Endrayanto is a full time lecturer at Department Mathematics, Faculty Mathematics and Natural Sciences. By training, he is an applied mathematicians, with topic interest in Stochastic Operations Research, Applications of Queueing Theory, Discrete and Stochastic Resource Allocation, Simulation etc. In the last 7 years, he is actively  involved in developing mathematical model for optimizing  resource allocation and logistics design in healthcare operations.