On fall 2017, Bogdan started PhD School of Mahtematics, module analysis, at the same faculty. So far, he has the perfect GPA (10/10) and has broaden his field of research to functional analysis, operator theory and their applications. He has published four scientific papers in this field and is active reviewer for prestigious scientific mathematical journals, such as Linear Multilinear Algebra (T&F) and Complex Analysis and Operator Theory (Springer). So far, he has given four talks in scientific congresses and workshops. He is currently working on his PhD concerning operator equations and their applications.