Jeff Haferman

Haferman Carpet

This is the “Haferman Carpet” by Jeff Haferman. It is a fractal I put together as part of a homework problem when I was an undergraduate at the University of Chicago, probably around 1984. There is a nice description of this fractal at Wolfram Mathworld. My professor at the time was Jeffrey Shallit. A colorized version of the carpet appears on the cover of the book Automatic Sequences by Allouche and Shallit. For the very mathematically inclined, there is an entry on the Haferman Carpet in The Online Encyclopedia of Integer Sequences.

Haferman Carpet at 5 iterations
Haferman Carpet at 5 iterations
 
Bacon & Erdős
Bacon & Erdős

 

Erdös Number

My Erdös Number is 4 (I co-authored a paper with Benjamin Kedem, who co-authored with Eric V. Slud, who co-authored with Robert W. Chen, who co-authored with Paul Erdös. I do not yet have an Erdös-Bacon number.

My Google Scholar citations page lists most of my academic writings. 

Here is a link to my CV.



LBAM

The “Light Brown Apple Moth” (LBAM) controversy is described in this Wikipedia article (search for my last name to read about my contribution). My short (and perhaps biased) description of what occurred is this: the U.S. EPA and California Department of Food and Agriculture believed that the LBAM was going to infest California and destroy crops. Aerial spraying of a supposedly “non-toxic” pesticide was authorized and two sprayings took place in late 2007 over populated areas in Monterey County, California. I co-wrote a paper with Dr. Dennis Knepp showing that the number of small particles in the spray was a health hazard. The CDFA lost a couple of lawsuits related to the spraying, and lost their appeal to the California Sixth District of Appeal. The spraying program was abandoned, and to-date, there has been no significant crop damage from the LBAM. A PDF version of our analysis (and some related correspondence) has been archived here.

Light Brown Apple Moth
Light Brown Apple Moth