Since joining Boston Consulting Group in 1994, Rainer Strack has led projects on strategy, process optimization, culture, organization, transformation, change, talent, and human resources management in many industries. From 1996 to 1998, he was based in BCG's office in Boston as a BCG Ambassador. In 2001, he was elected Partner & Managing Director, and in 2008, Senior Partner & Managing Director. In 2008 he was also appointed as one of the first BCG Fellows by BCG´s CEO.

Rainer has built and led BCG’s work in HR globally for ten years. He was the head of the People & Organization practice in Europe, the Middle East, and Africa for more than ten years, and also served as lead for the Social Impact practice in Germany. In 2001, he received the Erich Gutenberg Award for the development and implementation of new HR and customer-controlling concepts.

In 2007, 2009, 2011, 2013, 2015, 2017, and 2019 the journal Personalmagazin named Rainer one of the 40 leading minds in human resources in Germany—the only member of a top consulting firm to receive this distinction; and in 2021 he was inducted into the HR Hall of Fame in Germany. He has authored more than 100 reports and articles, on topics such as HR controlling and demographic risk management, and strategic workforce planning, published in the Harvard Business Review. He was a member of the Global Agenda Council for talent mobility of the World Economic Forum, co-leading the Future of Work initiative of the World Economic Forum and presenting several times in Davos. In 2014, he gave a widely viewed TED.com talk (more than 2 million views) on the topic of the global workforce crisis. In 2015, he completed a 1.5-year-long EMCC practitioner program to become an executive coach.