Haroula Kontorousi did a wonderful job designing the covers for the Primo Theory Series. She works as a freelance graphic designer out of Helioupolis, Athens.
A big thank you to Amber Brungard for her wonderful job editing the Revised Primo Theory Series. Amber is a freelance copyeditor and proofreader living in rural Pennsylvania where she maintains a piano studio. Natalie Nauquin, who edited the original series, received a Master of Music, Cello Performance at the Peabody Conservatory of Music where she was a graduate assistant in music theory. She is currently working as an Associate Analyst in AI/Machine Learning for Google.
A special thanks to Robert Poskevich who coded the interactive ear-training apps used in the Primo Theory Series and which are housed at mytheoryapp.com. Robert is currently a software engineer at SoftLayer, an IBM company. He received a Bachelor's Degree in Computer Science at the University of Texas in Austin and a Master's Degree in Computer Science from the Georgia Institute of Technology.