According to the rules of the award, the prize will go to a paper that was presented at LICS 1989 in lovely Asilomar. I was there as a second-year Ph.D. student and I presented a paper myself, but it was not award material.
The conference programme was really good and the award committee must have had a difficult choice. I do not know who will receive the award in mid-August, but let make a personal prediction: the award will be shared by the following two papers:
- Douglas J. Howe, Equality in lazy computation systems and
- Eugenio Moggi, Computational lambda-calculus and monads.