Donald V.Helmberger the Mentor

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Don is certainly missed,by me,and by so many others.I particularly miss the constancy I derived by thinking of him down in Pasadena on the third floor of South Mudd,under the tree in his office,looking at waveforms.I have myriad memories with him,formed not just as a student at the Caltech Seismo Lab but over the two decades following.It is therefore a bit difficult to choose which I might use to paint a picture of the person I knew,the person who did more to shape me scientifically than anybody except my father,and the person for whom I felt such affection.Obviously,pure science,waveform modeling done purely for curiosity to tease out Earth\'s secrets,should take center stage,particularly for this venue,but Don was a rich tapestry of humanity and science,so I thought I might tell a few offbeat stories,interwoven with the work I did with him,to offer up my sense of him.
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When I received the shocking news on August 13,2020 that our beloved Don passed away,I was deeply saddened.The feeling was worsened by the COVID-19 pandemic that essentially locked down everything so most of us were not able to attend his memorial ceremon
It has been more than a year since Don left us.He left us so suddenly.We planned to have a phone call after he settled down at his new house.However,it never happened.Although he had some medical issues persi-stently in his last year,he had been so dedica
It has been more than a year since Don passed away suddenly.Thinking about it still makes my heart hurt.I did not know Don Helmberger or any other famous geophysicists before joining the Seismological Laboratory at Caltech in 1989.In fact,I had barely hea
Seismic waveform modeling is one of the most powerful tools for understanding Earth\'s structure,since it allows waveforms to be quantitatively predicted using physical source representations and a velocity model.In the late 1960s,Don Helmberger develop
My first exposure to Don Helmberger\'s work was during a seismology class in my 2nd year in college where several students,including myself,were to present on Grand and Helmberger(1984).It was over my head,but seeing the beauty of the seismograms,tracki
Don trained many Ph.D.students over the~5 decades of his career,at least 45 were advised or co-advised according to a Caltech account.A large number were international students including a high percentage of Chinese students.The contributors to this artic