Markus Heinsohn is CEO and co-founder of Out of the Park Developments, and the lead designer and developer of Out of the Park Baseball and Inside the Park Baseball. In 1999 at the age of 21, Markus developed and released Out of the Park Baseball, a critically-acclaimed baseball simulation that has evolved into the most complete baseball management sim on the market. He studied computer science at the University of Hamburg, Germany, and lives in Heinbockel, a small village near Stade, Germany.

Andreas Raht manages Out of the Parks' corporate and league servers, vendor relationships, and company administration while also assisting with game development. The most seasoned software developer on the team, Andreas graduated from Technikerschule Hamburg in 1989, and founded his own software development company thereafter. In 2000, he joined Markus Heinsohn and the Out of the Park Baseball development team. An avid paragliding enthusiast, he lives with his wife, son, and daughter in Hollern, Germany.

Aurelio Barrios is the Art Director of Out of the Park Developments. He was born in Hamburg, Germany, where he got his graphics arts degree at the Technical Arts School in Hamburg in the year 2002. He has worked as a graphics designer for various companies during his studies, including OOTP Developments. In his leisure time he plays classical and South American guitar music.

Stevie B The newest addition to the team, Steve handles most of the administrative and project management aspects of OOTP, on a part-time basis. This saves Markus and Andreas from mind-numbing drudgery and allows them to just be creative geniuses. Steve is also the only team member on the "other side of the pond." He lives in the Philadelphia area.