Chudnov led in the creation of two online communities (oss4lib and usrlib) and in the organization of successful hackfests at Access2003 and Access2004. He has been described by a colleague as "a continual source of new ideas, and seems to be able to effortlessly bring people together to collaborate." Most recently, Chudnov led in the development of Unalog, an open source link sharing application that is finding wide usage and acceptance. Another colleague said, "no one is more influential in the area of Open Source software and the use of technology for social computing in libraries than Dan Chudnov."