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Team

A digital therapeutics team with experience
in medicine, technology and business

We develop treatment technologies drawing on experience in clinical practice, the pharmaceutical industry and software platforms.

64%Employees working in R&D
26Collaborative research projects
30+External expert advisers

Leadership

Seong Ji Kang
Company leadership

Seong Ji Kang

CEO · Co-founder

Education & qualifications
  • MD, Yonsei University
  • MPH, Seoul National University
  • Doctoral coursework in Public Health, Yonsei University
Experience
  • Ministry of Health and Welfare
  • Samsung Electronics Health Development Group
  • Adjunct professor, KAIST · Clinical faculty, Yonsei Medicine
Hye Kang Roh
Business, finance and operations

Hye Kang Roh

Deputy CEO · Co-founder

Education & qualifications
  • Business Administration, Seoul National University
  • Master’s in Information Management, KAIST
  • Chartered Financial Analyst (CFA)
Experience
  • Software engineer, Samsung Mobile
  • MIT Technology Review Innovators Under 35 (2022)
Youngbok Yoon
Research and engineering

Youngbok Yoon

Chief Technology Officer

Education & qualifications
  • Electronic Engineering, Pusan National University
  • Samsung Software Membership program
Experience
  • Samsung Software Center and Mobile
  • Led Tizen OS platform development
  • CEO, Bluehack
Yujin Lee
Clinical and medical science

Yujin Lee

Chief Medical Officer

Education & qualifications
  • Medicine, Yonsei University
  • Master’s in Public Health, Yonsei University
  • Board-certified psychiatrist
Experience
  • Chief Scientific Officer, Novartis Korea
  • Medical Director, Abbott
  • Psychiatry, Severance Hospital
Danny Kim
Medication-linked business development

Danny Kim

Head of DrugOS™ Business

Education & qualifications
  • Pharmacy degree and PharmD, Northeastern University
  • Master’s in Pharmaceutical Industry, Sungkyunkwan University
Experience
  • Business development, Pear Therapeutics
  • Pharmacy operations, PillPack
Soobin Lee
German subsidiary and European business

Soobin Lee

Head of Europe

Education & qualifications
  • BS and PhD in Electrical Engineering, KAIST
Experience
  • Head of WELT therapeutics GmbH
  • European business head, Neofect
  • Research professor, KAIST IT Convergence Institute

Team expertise

Clinical practice & pharma

Experience in patient care and pharmaceutical medical affairs informs our treatment development.

Relevant experience

Physicians and a board-certified psychiatrist
Medical affairs experience at Novartis and Abbott

Platform engineering

Experience building large-scale software and operating systems informs the design of DrugOS™.

Relevant experience

Software engineering at Samsung Electronics
Tizen OS platform development

Digital therapeutics & international markets

Experience in digital therapeutics business development, pharmacy operations and European markets supports product adoption and market entry.

Relevant experience

Business development at Pear Therapeutics
Pharmacy operations at PillPack
European medical device business

Product and research milestones

Treatment products

SleepQ® · MFDS-authorized and commercialized
SerenQ® · MFDS-authorized

Explore products
Research collaborations

Global research network

Korea

Pivotal studies and real-world evidence

University hospital collaborations evaluate treatment outcomes and build evidence in routine clinical care.

Severance · Yongin Severance · Seoul National University Hospital
United States

AI and new treatment technologies

Joint research spans personalized sleep AI, digital phenotyping, addiction, migraine and AI agent evaluation.

Northeastern · Dartmouth CTBH · BIDMC · CCHMC · DrivenData
Germany

Local clinical studies and personalized care

SleepQ®’s German study has completed patient follow-up and is analyzing results. Localization and digital patient twin research for personalized insomnia care continue.

Charité Berlin · DIfE · HMU Potsdam
Expert advisory network

Bringing condition-specific expertise into research and products

Experts contribute to treatment algorithms, study design, results review and product improvement.

Sleep disordersEating disordersAddictionHeadacheFunctional medicine
Explore clinical evidence Research partners
Careers at WELT