Miguel Mendonça, 43, published his first book about the extraterrestrial phenomenon – Meet the Hybrids – in 2015.
It told the stories of eight people who claim that they are hybrids between humans and aliens after their mothers were allegedly abducted and implanted with alien DNA during pregnancy.
Mr Mendonçaa, a former green energy expert who helped shape UK renewable power policies, went on to produce two volumes of his second alien-related work – We Are the Disclosure Part I and Part II – based on interviews with leading ufologists and “truth” campaigners the following year.
But, in his most recent work – Being with the Beings – a compendium of interviews with nine so-called alien contactees, published this year, Mr Mendonça describes his own alleged contact with aliens.
In the introduction, he states: “I knew at the outset that this project would trigger more contact experiences of my own, and sure enough, things have been getting extremely interesting around here of late.
“In my contacts, I have drawn upon the advice and approaches shared by the interviewees, and I can attest that they are working well for me.”
The author suggests that anyone can enjoy contact with aliens if they wish.
He adds: “I trust that you, the reader, can likewise approach contact with safety, security and good sense by working with the practical aspects of this material.
“Because it seems to be that the ET subject is as practical and available as you want it to be.
“If you desire contact you can have it, and this book offers advice on literally centuries of experience and insight, to those who wish to venture into these realms.”
Mr Mendonça said he even interacted with aliens during research for the book, after allegedly speaking to them through the nine “contactees” and interviewing them.
In fact, he claims the concept for Being with the Beings came in a “download” from an alien keen to get more known about the subject.
He added: “The project concept came to me as a download, with the title, outline, list of participants and list of questions, including: what message would they like to share? Evidently, someone wanted to say something.”
Mr Mendonça is convinced that the people he has interviewed are alien contacts, hybrids and even extraterrestrials themselves.
Sceptics however, argue there is no real evidence for anyone being abducted by an alien or for alien-human hybrids to exist.
They say the accounts from alleged experiencers are remarkably similar because they get repeated and then picked up online, and the growth of social media has led to more and more people making such claims.