apart from acting, what other profession was the person mentioned above in?
Singer.
Josh Groban
Joshua Winslow Groban (born February 27, 1981) is an American singer, songwriter, musician, actor, and record producer, who is known for his unusually dusky baritone voice. 
who played andy's brother in the office Josh Groban. this episode appeared in which season? Eighth season.
wiki:1794557
Josh Groban [SEP] Introduction
Joshua Winslow Groban (born February 27, 1981) is an American singer, songwriter, musician, actor, and record producer, who is known for his unusually dusky baritone voice. His first four solo albums have been certified multi-platinum, and he was charted in 2007 as the number-one best selling artist in the United States, with over 22.3 million records. , he had sold over 25 million records worldwide. Groban originally studied acting, but moved to singing as his voice developed. Groban attended the Los Angeles County High School for the Arts, a free public school on the campus of California State University, Los Angeles, where students receive a conservatory-style education.