During his tenure at Merck & Co., Mr. Johnson held numerous senior leadership roles, primarily within commercial operations, sales, and marketing, across a wide range of therapeutic categories. He led large scale regional, national, and global sales and marketing organizations worth over $3 billion in annual revenue, including in his role as Vice President of the U.S. Human Health East Commercial Operations Group for the Primary Care Sales division and prior to that, Global Brand Leader for Merck's Migraine franchise where he successfully led product launches in various countries around the world. Most recently, Mr. Johnson was the Chief Learning Officer for Merck's Global Learning and Development department. "I am honored to join Marinus' Board at this pivotal time following the launch of ZTALMY," said Mr. Johnson.