Marcus Biel (@MarcusBiel) is a well known figure in the Java community. He serves as an executive member of the Java community process (JCP) and was named Developer Champion (Groundbreaker Ambassador) by Oracle.

Marcus is a regular speaker at Java conferences all over the world, such as Oracle Code One San Francisco, JavaZone Oslow and JBCN Conf Barcelona. In 2019, he was listed as an “Ubiquitous Gold Speaker” by Heinz Kabutz.

Besides this, he works as a technical reviewer for renowned Java books such as Effective Java, Core Java SE 9 for the Impatient or Java by Comparison.

In 2015, Marcus started a Java blog and YouTube channel that makes Java accessible to passionate developers. There are many advanced tutorials that you can find online, but tutorials with a solid background like this one are rare. Today, the course is also available at freecodecamp.org and received a total of over 1.5 Million views so far.