There are two Jason Ho's who have programmed in the calculator community.
The first Jason Ho programmed many games for the TI-89 and TI-92 in 2001?. It is unsure whether he is still actively programming
ticalc.org author profile: http://www.ticalc.org/archives/files/authors/31/3179.html
calc.org search results: http://www.calc.org/author/Jason_Ho
The second Jason Ho started programming on Casio Calcs in 2008. In 2010, he obtained a TI-nspire and joined Omnimaga in September, which he is currently active on. He is also sometimes active on Cemetech. Jason Ho is still actively programming for the TI-nspire.
ticalc.org author profile: http://www.ticalc.org/archives/files/authors/109/10907.html
username: jhgenius01, jhgenius, Jonius7