Horizon Institute for Public Service — Alumni Retention Rate: 90%

Note: The source text does not contain any information about an 'Alumni Retention Rate' of 90% or any retention rate metric. While the source mentions that 'over 150 early- and mid-career professionals' have transitioned into policy roles and references the additional context about 90%+ transitioning to full-time roles, it does not explicitly state a retention rate percentage. The claim requires a specific metric (retention rate) that is not addressed in the provided source excerpt.