A useful set of academic essays on Bullinger. There isn't much about him written in English.
As with all such collections you will have to piece together a whole Bullinger from disparate topics. The authors mainly come from the broader Reformed world and/or academia so there is a lack of wholehearted sympathy with the joy of Reformed teaching.
Due to the links with England set up by Thomas Cromwell (not explored in this book) Bullinger was a major figure in the English Reformation and his most important work, The Decades, a series of lectures in five sets of ten, were influential in settling Reformed doctrine on the Elizabethan church where it was required reading for all ministers (though I don't know how many of them read it!)
Bullinger had a tumultuous early life being plucked from teaching at a school/monastery near in Kappel near Zurich: a town that was lost to Roman Catholicism due to religious wars in Switzerland. He was unexpectedly called to succeed Zwingli after the latter's death in the Battle of Kappel in 1531.
He was a central and dominant figure in Zurich from then on. Though he did not travel a network of correspondents kept him informed of events around Europe and he was much sought for advice. His long life, he died at 71 in 1575, gave him prominence in theological matters.
A theological seminary was set up that was influential and succesful for some years, attracting teachers from around Europe. It went into decline from 1562 when city officials prohibited the employment of teachers from outside Zurich.
Interestingly congregational singing, famously dropped by Zwingli, was not reintroduced until 1598, some time after Bullinger's death.
Useful as a work to gain some insights into the life and times of Zurich's longest lived Reformer.