An investment banker is someone who works in a financial institution or in a large bank's division that is involved in raising capital for governments, companies and other entities. They raise money by issuing and selling securities in the primary market and assist public and private corporations in raising funds in the capital markets (both debt and equity). They may also provide strategic advice to their clients on specific transactions such as mergers and acquisitions and other types of financial transactions.
An investment banker requires specific skills, such as excellent written and verbal communication and number-crunching abilities. Their work hours are very long and grueling, but on the upside they are generally a very well-paid individual. An investment banker's educational requirements include an MBA from a top-notch institution and/or the Chartered Financial Analyst designation.