There are 7 books in the StarBridge Series series. The newest book is Voices of Chaos which came out in 1998.

1
Starbridge

Book cover of Starbridge
The students of Starbridge Academy--a training school for Earth's young diplomats, translators, and explorers--meet representatives from sixteen other races and, together, they journey across the universe
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2
Silent Dances

Silent Dances
Deaf since birth and able to withstand the ear-shattering sonic cries of the Grus, Tesa is an ideal choice for ambassador to their planet, but other alien forces want to destroy the Grus and Tesa must make peace with them and save the inhabitants of her adopted planet

3
Shadow World

Shadow World
In what is to be his last assignment, Mark Kenner sets out on a diplomatic mission to bring the Elspind into the Cooperative League of Systems, but he must first survive in an environment that is hostile to the pending alliance

4
Serpent's Gift

Serpent's Gift
When an archaeological find beneath the surface of the Starbridge Academy's asteroid base threatens to destroy their dreams for the future, instructor Serge and student Heather spring into action. Original.

5
Silent Songs

Silent Songs
On the planet Trinity, Tesa, the deaf human ambassador, and a young telepath become Trinity's last hope of battling an alien race of dangerous amphibious beings that threatens to draw the planet into a deadly intergalactic war. Original.

6
Ancestor's World

By A.C. Crispin , T. Jackson King,

Ancestor's World
When Ancestor's Valley of tombs is threatened by visitors from the stars, archaeologist Gordon Mitchell and his team from StarBridge struggle to salvage the burial sites, until a team member is brutally killed

7
Voices of Chaos

Voices of Chaos
The Arrekhi, feline beings from a newly discovered planet, hide a vicious secret that could jeopardize their admittance into the interplanetary Cooperative League of Systems and unleash havoc and carnage across the planet. Original.