In 1956, I was searching for a Ph.D. topic and I selected time series analysis as being an area that was not very developed and was potentially interesting. I have never regretted that choice. Occasionally, I have tried to develop other interests but after a couple of years away I would always...

There is a type of art that is known as “naive,” which can be very simplistic and have a certain amount of charm. Reading about my own work on sunspots published in 1957 also brings to mind the description “naive.” I was certainly naive in thinking that I could undertake a piece of...

In 1956, I was searching for a Ph.D. topic and I selected time series analysis as being an area that was not very developed and was potentially interesting. I have never regretted that choice. Occasionally, I have tried to develop other interests but after a couple of years away I would always...