functioning as an examining magistrate. Judges may work alone in smaller cases, but in criminal, family and other significant cases, they work in a panel. In some civil law systems, this panel may include lay judges. Unlike professional judges, lay judges are not legally trained, but unlike jurors, lay judges are usually volunteers and may be politically appointed. Judges are often assisted by law clerks, referendaries and notaries in legal cases and by bailiffs or similar with security. Requirements and appointment There are both volunteer and professional judges. A volunteer judge, such as an English magistrate, is not required to have legal training and is unpaid. Whereas, a professional judge is required to be legally educated; in the U.S., this generally requires a degree of Juris Doctor. Furthermore, significant professional experience is often required; for example, in the U.S., judges are often appointed from experienced attorneys. Judges are often appointed by the head of state. In some U.S. jurisdictions, however, judges are elected in a political election. Impartiality is often considered important for rule of law. Thus, in many jurisdictions judges may be appointed for life, so that they cannot be removed by the executive. However, in non-democratic systems, the appointment of judges may be highly politicized and they often receive instructions on how to judge, and may be removed if their conduct does not please the political leadership. Judge as an occupation Judges must be able to research and process extensive lengths of documents, witness testimonies, and other case material, understand complex cases and possess a thorough understanding of the law and legal procedure, which requires excellent skills in logical reasoning, analysis and decision-making. Excellent writing skills are also a necessity, given the finality and authority of the documents written. Judges work with people all the time; by the nature of the job, good dispute resolution and interpersonal skills are a necessity. Judges are required to have good moral character, i.e. there must be no history of crime. Professional judges often enjoy a high salary, in the U.S. the median salary of judges is $101,690 per annum, and federal judges earn $208,000–$267,000 per annum. Symbols of office A variety of traditions have become associated with the rank or occupation. Gavels (a ceremonial hammer) are used by judges in many countries, to the point that the gavel has become a symbol of a judge. In many parts of the world,