Patrick founded BodyFast, the world's most successful intermittent fasting app with 23 million installs after 3.5 years and an eight-digit yearly revenue. Patrick also founded two other very successful companies with millions of users: GRIN.com and Open Publishing. GRIN.com is Germany's leading academic publishing platform with over 200,000 e-books, 150,000 printed books and 25 million visits a year. Open Publishing is a leading digital publishing platform for publishers and book wholesaler's.
