Mark Roos is a professional in their field. They is proficient in English. Colleagues describe them as "Mark is opmerkelijk goed in analyse en definitie. Hij is ondernemend en energiek. Heeft veel verstand van alles en weet zijn collega's te bezielen met invoeling, visie en een positieve attitude." and "Mark Roos is a hard worker, very focused on his goal, a pleasant communicative character with a high sense of knowledge. Mark Roos is friendly but demanding of his environment to achieve a realistic level. Mark Roos is very socially driven, he proves time and again with his practical side, its voluntary contribution to the Dutch police corps. Mark Roos knows a very proper use of his language to handle. He has a good sense of humor, and is literally, never too late to work."