At a business or social meeting, shake hands with everyone present when arriving and leaving. When introducing yourself, never use your title. Introduce yourself by your last name only. Never shake hands with one hand in your pocket. Names and Titles Use last names and appropriate titles until specifically invited by your German host or colleagues to use their first names.
Titles are very important.
Never use titles incorrectly and never fail to use them. If unsure, err in favor of a higher title. A Doktor can be either a medical doctor or a holder of a Ph.D. Two titles should not be used at the same time, except when addressing a letter to someone. Body Language Germans may appear reserved and unfriendly until you get to know them better. Never put your hands in your pockets when talking with someone.