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During the 32 years that I spent in Computer Science at The University of Iowa, between 1970 and 2002, my research focused on human information processing. I studied a variety of topics, including human memory, natural language processing, human vision, visual imagery, and human control of movement. I published many of the results of my investigations in The Cerebral Computer, published by Lawrence Erlbaum Associated, Inc. in 1987. I now enjoy photography and periodically show recent pictures here.

1. Bobolink

2. Mourning Dove

3. Gadwall

4. Snowy Egret

5. American Goldfinch

6. Purple Finch

7. Herring Gull

8. Eastern Kingbird

9. Black-bellied Plover and Dunlin (left)

10. Greater Yellowlegs

11. Lesser Yellowlegs

12. Purple Sandpiper

13. Willet

14. Song Sparrow

15. Eastern Towhee

16. American Redstart

17. Black-throated Blue Warbler

18. Black-throated Green Warbler

19. Chestnut-sided Warbler

20. Northern Parula

21. Prairie Warbler

22. Yellow Warbler

23. Yellow-rumped Warbler

24. American Woodcock

May is when many birds, including the wood warblers, miagrate through Massachusetts. I took these pictures (among many others) on Monday, May 11th and Wednesday, May 13th, at the Parker River National Wildlife Refuge in Newburyport, Massachusetts. Linda and I saw about 70 bird species on those days.