Huseyin Topaloglu is a Professor at Cornell Tech and in the Operations Research and Information Engineering Department at Cornell University. Professor Topaloglu’s group works on assortment planning problems in online retail operations. Online retailers have the opportunity to customize the product assortment that is offered to each individual customer. The challenge is to use data from past purchases to understand how each customer would make a choice among the products offered to them, and use this information to decide which assortment of products to offer to a customer landing on a website. The work involves integrating ideas from econometrics and psychology to build models of the customer choice process and developing combinatorial optimization techniques to choose the right product assortment to offer.