One of the benefits/privileges that I enjoy is the ability to travel and I do so frequently.
The most reliable and fastest way to reach me is via email at firstname.lastname@example.org. I check this many times a day regardless of location. If I am/will be off the internet, you will receive an out of office reply message, otherwise a same day or next day response should be forthcoming.
My cell phone number is via the United States +1 281 797 61 83. I will answer if possible but this service is not nearly as globally reliable as email.
If you have to mail me something, please scan and email for a prompt response. I do not use postal mail.