Reverend Dean Koyama is the resident minister at the Palo Alto Buddhist Temple. Before his appointment to Palo Alto in June 2013, he served as the resident minister of the Mountain View Buddhist Temple (2003-2013), resident minister at the Tacoma Buddhist Temple (1996-2002), and associate minister at the Seattle Betsuin Buddhist Church (1989-1996).

A native Californian, Reverend Koyama was born and raised in Sacramento. He studied Biology at Sacramento City College and later received a Bachelor of Science degree in Zoology from the University of California, Davis. After working as a pharmacy technician at Mercy General Hospital, Reverend Koyama, began attending the Institute of Buddhist Studies (IBS) in Berkeley, California. He earned a Master of Arts degree in Buddhist Studies from the IBS in 1985 and subsequently earned another Masters Degree from Ryukoku University in Kyoto, Japan. The years of studying culminated in his entry into the ministry in 1989.

An active person, Reverend Koyama enjoyed jogging, playing volleyball, and cycling in his free time. He jokingly mentions that due to "old age", he now limits his physical activities to walking his Jack Russell Terrier mix, Niko. In addition, Reverend Koyama continues to practice Aikido, which he has done for almost 40 years and holds a black belt 4th dan degree.

Reverend Koyama and his wife Linda have three sons—Justin, Curtis and Tommy.