About 70% of all historians are employed by colleges or universities. Their earnings vary depending on their education, experience and the type of job they perform. Historians employed by private companies usually earn more. Many of them also increase their earnings by engaging in writing or lecturing on special projects. On average, a historian earns $55,000 per year. Historians study events, ideas, institutions and individuals of the past. They rely mostly on written records for evidence to support their claims. However, in certain cases, they may have to use physical objects such as photographs, costumes and tools to describe the past more effectively.