Dr. Valery Serov is professor emeritus of applied mathematics at University of Oulu, Finland. He is highly experienced scholar who has taught extensively many courses on partial differential equations, Fourier analysis, spectral theory, complex analysis and more. His research interests are mostly devoted to inverse scattering and inverse spectral problems. He has authored two textbooks earlier and his extensive list of publications contains more than 100 papers. PhD Markus Harju holds a docentship on applied mathematics at University of Oulu, Finland. He is an experienced educator who is currently teaching engineering mathematics at the undergraduate level. His research interest fall under inverse scattering problems but he also works on numerical and applied mathematics met in engineering and medical disciplines.