Arthur Bloch — American Writer

Arthur Bloch is an American writer, author of the Murphy's Law books. He has also written a self-help satire called Healing Yourself with Wishful Thinking. Since 1986 he has been the producer/director of the Thinking Allowed PBS television series... (wikipedia)

Friends come and go but enemies accumulate.
If you improve or tinker with something long enough, eventually it will break or malfunction.
Don't force it, get a bigger hammer.
Every solution breeds new problems.
The Ninety-Ninety Rule of Project Schedules - the first ninety percent of the task takes ninety percent of the time, and the last ten percent takes the other ninety percent.