I found my hard copy of the Full Moon magazine (NKT) from way back (1994) and found this praise to Venerable Geshe-la.
A letter to Geshe Kelsang Gyatso
Dear Venerable Geshe Kelsang Gyatso
I sincerely hope that this letter finds your health and body well. I do wish you to live a very long life as it will no doubt bring tremendous benefit to many as it has in the past.
Learned spiritual teachers are becoming rare. Buddhist scholasticism in itself is not really beneficial, but combined with practice is something rare. You. I feel, are one of those rare combinations. Therefore I offer my prayers that your holy life may become stronger and live a long life.
Your books are not easy for me to get, but the few I have are excellent. I have gained tremendous knowledge from them. They are very complete, concise, organised, easy to follow, and well translated. Guide to Dakiniland goes with me wherever I go.
Very important to me is that the author has lineage, states the lineage, follows a recognised text that has infallible authors themselves, and the translating authors have received the commentary themselves. Your works contain all of the above. I have confidence in your books.
Because of the rarity of books, works, and sadhanas/commentaries of Je Phabongkhapa and Trijang Dorjechang translated in full, I rejoice from the depths of my heart in your works, your students assistance, and Tharpa Publications. Also the quality of the books and illustrations are excellent.
I therefore sincerely request you and your students to please continue. Your works are highly appreciated and kept as holy objects to continuously refer to when in question.
I request you Geshe-la, to please remain long and continue your most beneficial works.
I offer my humble prayers towards this,
Tsem Tulku Rinpoche
Tsem Ladrang
Ganden Shartse College
Mundgod, India