Most proponents of Radical Longevity share a deep enthusiasm for life well-lived, and Otto Siegel embodies this spirit with joy and passion. His life story reads like a veritable bucket list of journeys made, lessons learned, and goals achieved: a gifted teacher, genius coach, sought-after corporate trainer, seasoned entrepreneur, and expert ski instructor, Otto speaks English, Spanish, Portuguese, and three Germanic dialects, has studied Latin and Greek, has lived on three continents and traveled across five.

As a Master Certified Coach (MCC) since 2007 and a member of People Unlimited and the Coalition for Radical Life Extension, he has been actively involved in the longevity movement in Germany and the US since 1990. He supports progressive and passionate individuals in the second half of their first century to translate valuable longevity insights into daily action.

Since 2017, he has been serving Longevity clients, coaching them, and promoting his work as a speaker and vendor at international events like RAAD Fest and the American Association for Anti-Aging Medicine A4M global conference in Las Vegas.