Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

Troy Segal is an editor and writer. She has 20+ years of experience covering personal finance, wealth management, and business news. Erika Rasure is globally-recognized as a leading consumer economics ...

A lot of our energy comes from non-renewable sources such as coal, oil and gas. These resources are made up from the remains of ancient animals and plants that develop over millions and millions of ...