1、我在这所学校担任董事长和校长.
I held the office of school chairman and school principal* at this school.
* 小学/中学/高中校长 用 school principal, 大学校长用 school president
2、自1990年至今投资成立XX学校.
Established and invested in XX school from 1990 up to now.
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1.I serve as the chairman and the principal in the school.
2.The XX school has been invested and founded since 1990.
1, I served as chairman of the board in this school, and the principal. 2, since 1990 investment in XX school.