On the occasion of The Leading Edge's 20th anniversary, it seems appropriate to pause and consider progress in our science over that period of time. My topic is seismic data processing, and many of the advances discussed here were published first in Geophysics or other peer-reviewed journals, then appeared in more digestible form in the pages of TLE. This is an important role TLE continues to play.

The first thing to consider is the scope of the assignment. The last 20 years have seen 267 monthly or bimonthly issues of Geophysics, which I...

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