1864 – Born on the 7th of January in Boseong County, Korea.
1882 – He passed the civil service exam and became a junior officer.
1884 – Seo Jai-Pil, following Kim Ok-Kyun, was involved in the Kapsin Coup, a radical attempt to overturn the old regime and establish equality among people.
1890 – He became the first Korean-American acquiring citizenship of the United States.
1892 – He studied medicine at the Columbian College, receiving a medical degree.
1894 – He married Muriel Armstrong, a niece of the former president of the United States, James Buchanan and had two daughters later Stephanie and Muriel.
– Japan defeated China in the war which occurred in the Korean Peninsula, and Korean cabinet was filled with reformists.
1898 – Conservatives accused Jaisohn and the Club of seeking to replace the monarchy with a republic, and the Korean government requested Jaisohn to return to the US.
1924 – Jaisohn went legally bankrupt due to his political engagement and had to continue medical profession to make a living.
1948 – He decided to return to the United States.
1951 – Died on the 5th of January in Norristown, Pennsylvania.