Sajung is a Johns Hopkins University adjunct professor, currently teaching DNA analysis courses in graduate school from 2017. He has a research contract with National Institutes of Health for conducting mouse & human cells genome engineering using CRISPR-Cas9 for carcinoid tumor. As for data science, he is a Certified Health Data Analyst (CHDA) from AHIMA. He is also a serial entrepreneur (Doctomics & Ztomed) from 2015. He received Ph.D. in biomedical sciences at University of Hawaii at Manoa in 2009. He attended University of Hawaii John A. Burns School of Medicine, M.D. program and completed 121 credits from 2009 to 2014. He received M.B.A. with double concentrations in healthcare management and entrepreneurship from Johns Hopkins Carey Business School while receiving deans scholarship for academic excellence for straight three years in 2018.