Katerina Kalfamanoli joins Colliers as director of investments and commercial leasing. She leaves Cushman & Wakefield, where she was senior surveyor, capital markets. Prior to that she was a managing director and head of agency at DTZ Greece. Spyros Raptis also joins as senior advisor and valuation professional. He previously worked at Axies Lambert Smith Hampton as senior valuer and at Savills Hellas as valuation analyst.