Farzollah Gholizadeh kalan's academic journey began in psychology, leading him to explore the interconnectedness of mind and body. This exploration directed his studies toward healthy lifestyle practices, natural nutrition, and treatments such as Unani medicine, acupuncture, Ayurvedic medicine, and the use of medicinal plants. He furthered his education in oriental medicine and human nutrition sciences.

Throughout his career, Dr. Kalan has collaborated with universities and research centers across Iran, Malaysia, Germany, India, China, Russia, and Italy, resulting in numerous books and articles. In 2010, he launched the "Dr. Kalan" brand of natural products in Malaysia, later relocating production to Turkey in 2016. These products are inspired by nature and adhere to the principles of natural medicine, aligning with human natural temperaments.

Currently based in Ankara, Turkey, Dr. Kalan continues to teach, research, write, and provide guidance on healthy living and nutrition. He participates in conferences, seminars, and various media programs, promoting a positive approach to life. His publications span both Persian and Turkish languages, covering topics from psychology to traditional medicine.

Additionally, Dr. Kalan shares insights on traditional medicine and human health on his YouTube channel and Instagram and he is the CEO of DRKALAN company .