OCP Java SE 6 Programmer Practice Exams (Exam 310-065) (Certification Press) About the Author Bert Bates, SCJP, was a lead developer of the SCJP and SCWCD exams for Sun. He is the coauthor, with Kathy Sierra, of SCJP Sun Certified Programmer for Java 6 Study Guide. Kathy Sierra, SCJP, was a lead developer of the SCJP exam and the SCWCD exam. She was also a certified Sun Java instructor and is the founder of the world's largest Java certification website, javaranch.com.