Waldo Vieira (1932-2015) was a Brazilian figure known for his work in spiritual movements, medicine, and dentistry. Initially involved in Spiritism, he collaborated with the renowned medium Chico Xavier in the 1950s, co-authoring books and engaging in philanthropic and mediumistic activities. However, around 1966, Vieira diverged from Spiritism, developing his own distinct perspectives.

Following this separation, he dedicated himself to studying parapsychological phenomena, including astral projection and altered states of consciousness. He became affiliated with prominent psychical research societies in the US and UK. Vieira is credited with establishing two new fields of study: Conscientiology, which focuses on consciousness, and Projectiology, concerning projection phenomena. He authored numerous books on these subjects, beginning in 1979 until his passing in 2015, with his works translated into several international languages.

Waldo Vieira established the fields of study he named Conscientiology and Projectiology. These disciplines emerged from his post-Spiritist research into parapsychology, particularly focusing on topics such as astral projection and variations in consciousness. His affiliations with organizations like the American Society for Psychical Research and the Society for Psychical Research provided a framework for his investigations. Vieira's work in these areas led to the publication of his first book on the subject in 1979, marking the beginning of a prolific writing career dedicated to exploring these esoteric themes.

Born in 1932, Waldo Vieira's early life saw him embrace Spiritism. He pursued dual careers in medicine and dentistry, demonstrating a commitment to both scientific and spiritual pursuits. A significant period in his life involved his association with the prominent Brazilian medium Chico Xavier, starting around 1955. Together, they collaborated on multiple books related to Spiritism, established a Spiritist center, and engaged in philanthropic work and voluntary mediumship, including the practice of psychography.

Around 1966, Vieira's spiritual path took a distinct turn as he became a dissident Spiritist. This shift marked the end of his collaboration with Chico Xavier and the beginning of his independent exploration of consciousness and parapsychological phenomena. His research expanded to encompass altered states of consciousness and astral projections, leading him to found his own unique fields of study. This period of intellectual independence defined the latter half of his career, culminating in his extensive body of written work.