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I have a B.A. in Mathematics from Bard College (1978). I enrolled in the Courant Institute of Mathematical Sciences with the goal of becoming a math professor, but quickly became immersed in the emerging world of computers.

I did some database consulting with clients like NY Telephone.

In the mid-1980's I founded Microvox Systems, Inc., to create a voice mail-based dating service. As far as I know, it was the earliest such service to go into development, and was one of the earliest voice mail services of any type.

Also as far as I can tell, this dating service was the first instance of of a technology now known as "collaborative filtering". It was used to help the service match people together. But soon I noticed that the same basic idea could also be used to do things like match music to people, so I started working some better mathematics to run it. (CF, though not my own version, now powers, for example, Spotify, Apple's iTunes Radio, and many other services.)

Later, I continued working on the mathematics related to collaborative filtering. A spin-off algorithm turned out to be useful for spam filtering. My suggestions for spam filtering are included a number of spam filters, including SpamAssassin (PC Magazine Editor's Choice), SpamSieve (MacWorld Software Product of the Year), Mozilla, AGMSBayesianSpam, Bogofilter, DSPAM, Eudora, Hexamail, Popf, and Spambayes. Over time I've noticed links to my posts on spam math on websites in Czech, Dutch, Finnish, French, Japanese, German, Russian, and Spanish, which has been fun. At that time, I was also a part-time Research Director at ActiveState, advising them on spam technology.

As VP/Advanced Technology and cofounder of Athenium, L.L.C., I managed the development of it's successful TeamThink product and am a co-inventor of the related patents.

For most of the 2000's, I was CTO of Emergent Discovery, LLC. Good technology, but never found its business niche.

I have a number of patents, listed in my LinkedIn profile. One of them, US patent 5,918,014, is now owned by Google and is one of their most fundamental advertising-related patents.

I’m presently filing new patents and building a new software product.


my family, my business, great music of all kinds (classical, late bebop-period jazz, interesting songwriters like Leonard Cohen and Randy Newman), programming, statistics, songwriting (I play guitar and write), movies...