Who guided the baking style of the three founders of Starbucks and brought deep baking to Seattle?

A few months before Starbucks opened, the three founders went to Berkeley to learn from baking master Alfred Li Dingding. Peter, a Dutch immigrant, has great attainments in coffee. /kloc-in the 1950s, Bitter began to import coffee from the United States. From 65438 to 0966, Peter opened a small shop called Peter Coffee and Tea in Berkeley, California, with a group of loyal customers. The three founders admired Bitter's craftsmanship and his unique deep roasted coffee, and went to Bitter's shop many times to learn coffee skills. They study while helping in the bitter shop. Bitter instilled the uncompromising concept of high-quality coffee into three young people and constantly emphasized the importance of enriching their coffee knowledge. It is Bitter's teaching that determines Starbucks' basic idea of pursuing coffee quality in the future.