Amid the prolonged COVID-19 pandemic, the miraculous breakthroughs of multiple effective and safe COVID-19 vaccines offer hopeful prospects. Yet, the endgame of the pandemic is not vaccines; it is vaccination. The daunting challenge of vaccinating the world offers ample investigative...

Distributing scarce resources such as COVID-19 vaccines is often a highly time-sensitive and mission-critical operation. On top of that, most COVID-19 vaccines require two doses to be administered three or four weeks apart. How to effectively roll out two-dose vaccines is a crucial policy...

Although influenza vaccine shortage is often attributed to low supply, it has been observed that even with abundant supply, a major shortage can still occur due to late delivery. In this paper, motivated by the influenza vaccine industry, we study a supply chain contracting problem in the...

Public transit ridership tumbled amid the COVID-19 pandemic, contributing to enormous budget deficits and prompting slashed or eliminated service offerings across the United States. These service cuts may cause a vicious cycle and end up hurting the most vulnerable riders who cannot afford to...