Seo Jung-jin rebuilt his career after Daewoo's collapse by organizing the investor group and biotechnology strategy that became Celltrion, then led the company from a contract-manufacturing startup into a global biosimilar producer. [1][3]
Daewoo's collapse pushed him into entrepreneurship
Forbes reported that Seo was working as a strategic adviser at Daewoo Motor when the Asian financial crisis and the company's collapse left him without a job in 1999. [1]
He formed Nexol in 2000 to study new industries, concluded that biotechnology offered unusually high barriers to entry, and recruited former Daewoo colleagues while seeking investors and technical partners. [1]
Seo and the investor group partnered with California biotechnology company VaxGen to form Celltrion, with Korean investors supplying capital for the Songdo plant and VaxGen initially contributing technical knowledge and training. [1][2]
Biosimilars turned the startup into a global drug company
Celltrion later built its reputation around biosimilars, including the world's first monoclonal-antibody biosimilar, and the company continues to identify Seo as chairman while expanding into newer biologic drugs. [3]
The financial path is primarily self-created: Seo moved from salaried corporate work into founding and financing a new biotechnology platform, then retained leadership as it scaled. The reviewed record does not establish a substantial inherited operating base or family fortune at the start. [1][4]
Sources for background
Sources reviewed Sep 26, 2026.
- Career Comeback · Forbes · May 1, 2009
- Career Comeback: Seo Jung-jin and the founding of Celltrion · Celltrion
- Celltrion unveils strategic vision for advancing its innovative drug pipeline · Celltrion · Jan 15, 2025
- Seo Jung-jin · Forbes · Apr 13, 2026
Comparable Healthcare billionaires
Similar Healthcare billionaires by estimated net worth.
