He lost his father in his early teens, which made him face the reality of life quite early and which had a formative influence on him, both as a person and as a scientist. As a person in the sense that he always felt strong responsibility for everything he did and for the people who depended on him privately and professionally. As a scientist in the sense that, although he loved theoretical work, he never lost sight for the so-called more practical aspects and problems of computer science.

The author establishes four infinite hierarchies of families of context-free languages based on (i) finite unions, (ii) number of nondeterministic moves of nondeterministic pushdown automata, (iii) finite intersections, and (iv) finite concatenations, respectively. All these hierarchies lie between the families of deterministic and unambiguous context-free languages.

The authors investigate the nature of nondeterminism by restricting the number of nondeterministic moves in accepting computations of a multitape Turing machine. Despite one erroneous "theorem", the paper presents some interesting facts which add to our understanding of automata-based complexity theory.

He married in 1978 and lived with his wife Bharati in Santa Monica, where their daughter Sreelata was born, until 1980. As much as Chandra enjoyed life there, professionally and privately, he missed a close interaction with the more practical side of computer science. So when the opportunity arose to join Bell Labs in Murray Hill, he immediately saw this as a chance and moved to New Jersey in 1980, where a few years later his son Kumar was born. Those years were, in his own words, among the happiest years of his life, as the research culture at Bell Labs provided exactly the close and stimulating interaction between theory and applications that he had always been looking for. And since he always liked teaching, he also taught courses at Steven's Institute of Technology in New Jersey, first as an Adjunct Professor and later as a Distinguished Industry Professor.

He spent 23 years doing research and managing research in the family of Bell Labs at AT&T, Lucent and later Avaya, all in New Jersey. His last position was Vice President of Research Realization Center in Avaya Labs. Some of the noteworthy accomplishments in Bell Labs are: (a) a language and a software tool now called "Backtalk" with Dr David Belanger in 80s; it is still used in AT&T for data analytics on very large databases, (b) concepts and the components for Software-implemented Fault Tolerance and Software Rejuvenation with Dr Yennun Huang in early 90s; they are now widely used in industry and academia, (c) a Layer 7 network switch based on Linux for web content distribution in his department in late 90s; it led to a new business group in Lucent, and (d) an enterprise network monitoring system called Expertnet in early 2000s; it is still a key component in several products and services from Avaya.

Our innovative code generation technique interprets a program abstraction, derived after studying a class of programs, against an attributed tree, representing a specification of problem instance, to generate a target program for solving the problem from the specification. The code generator which has two parts is flexible in two aspects. First, a basic part allows flexibility within a domain by interpreting many abstractions of problems. A domain dependent part allows the technique to be applied to different problem domains.

Motorola Inc on Monday announced the appointment of Chandra Kintala as Director, India Research Lab. Based in Bangalore, Mr Kintala will oversee the work of all Motorola Lab centres of excellence in India.

I am very enthusiastic and delighted to join Motorola. I am now returning to an industry applied research environment. Motorola Labs is at the forefront of applied research and leading the team in India will be a great opportunity as well as an honour.

There he was responsible for research in mobile communications, system sciences and for academic relations with top technical institutes in India.

He enjoyed travelling, reading, writing, and spending time with family and friends.

Chandra Kintala was a man of learning and insight and possessed extraordinary clarity of mind. His prodigious intellect was rivalled only by his kindness and humanity. His death is a loss to the U.S. technical community and to the nation, for teachers such as Chandra are badly needed.