Your best bet is email. I try to respond to email messages within 24 hours. firstname.lastname@example.org
I do not recommend phone calls. Because schedules are often tight, phone calls normally go to voicemail, where they wait until I get a chance to check them. Then, I need to find dedicated time in a quiet place to return the call, so there if often a signifcant delay. I want to hear from you and email works best.
Full contact details are on the Hypnotechs.com Contact Page.