At 35, he left Microsoft to focus his time on investment management and philanthropy, becoming a quiet but well-respected donor to the LGBTQ social justice movement, the environment, health and human services, and education.
After his death, the Chronicle of Philanthropy called Weiland's bequest the 11th largest charitable gift in the nation with more than $165 million distributed between 20 nonprofit beneficiaries.
They worked together to create a payroll program in COBOL for a company in Portland, Oregon, and wrote scheduling software for Lakeside School.
His largest gift was to establish an endowed chair in his mother's name at Stanford - the Martha Meier Weiland professorship in the School of Medicine.
During his time as a volunteer on the Pride Foundation's board of directors from 1997 to 2001, he helped win the fight to get General Electric to include sexual orientation in their non-discrimination policy.
Beneficiaries included: Lambda Legal, GLSEN, GLAAD, amFAR, the Task Force, OutRight Action International, PFLAG, Project Inform, In the Life Media and OutServe.