Today, crowdsourcing is used to "taskify" any job ranging from simple receipt transcription to collab-orative editing, fan-subbing, and citizen science. Existing work has mainly focused on improving the processes of task assignment and task completion in a requester-centric way by optimizing for outcome quality under budget constraints. In this paper, we advocate that accounting for workers' characteristics , i.e., human factors in task assignment and task completion benefits both workers and requesters, and discuss new opportunities raised by worker-centric crowdsourcing. This survey is based on a tutorial that was given recently at PVLDB [2].