diff --git a/.dockstore.yml b/.dockstore.yml
index 004bf9955..91f8eabab 100644
--- a/.dockstore.yml
+++ b/.dockstore.yml
@@ -220,3 +220,8 @@ workflows:
    primaryDescriptorPath: /workflows/utilities/wf_theiavalidate.wdl
    testParameterFiles:
     - empty.json
+ - name: Usher_PHB
+   subclass: WDL
+   primaryDescriptorPath: /workflows/phylogenetics/wf_usher.wdl
+   testParameterFiles:
+    - empty.json
\ No newline at end of file
diff --git a/tasks/phylogenetic_inference/task_usher.wdl b/tasks/phylogenetic_inference/task_usher.wdl
new file mode 100644
index 000000000..4de9ee9d7
--- /dev/null
+++ b/tasks/phylogenetic_inference/task_usher.wdl
@@ -0,0 +1,140 @@
+version 1.0
+
+task usher {
+  input {
+    Array[File] assembly_fasta
+    String tree_name
+    
+    # the protobuf tree used to place sequences onto -- required if not mpox or sc2
+    File? mutation_annotated_tree_pb
+
+    # the reference genome to align to -- required if not mpox or sc2
+    File? reference_genome
+    Int subtree_size = 20 # change value to indicate how many of the closest-related samples you want to show in a subtree
+
+    # what organism to run usher on -- the organisms below have default data provided
+    String organism # options: sars-cov-2, mpox, RSV-A, RSV-B
+
+    # runtime
+    String docker = "us-docker.pkg.dev/general-theiagen/pathogengenomics/usher:0.6.2"
+    Int memory = 8
+    Int cpus = 2
+    Int disk_size = 100
+  }
+  command <<<
+    if [ "~{organism}" == "mpox" ]; then
+      echo "DEBUG: organism is mpox, downloading latest UShER data"
+      wget "https://hgdownload.gi.ucsc.edu/hubs/GCF/014/621/545/GCF_014621545.1/UShER_hMPXV/mpxv.latest.masked.pb.gz"
+      # unzip protobuf file into renamed file
+      gunzip -c mpxv.latest.masked.pb.gz > mutation.annotated.tree.pb
+      
+      # download versioning information of protobuf
+      wget "https://hgdownload.gi.ucsc.edu/hubs/GCF/014/621/545/GCF_014621545.1/UShER_hMPXV/mpxv.latest.version.txt"
+      cat mpxv.latest.version.txt > PROTOBUF_VERSION
+
+      # download mpox reference used to make usher protobuf
+      wget "https://hgdownload.gi.ucsc.edu/hubs/GCF/014/621/545/GCF_014621545.1/GCF_014621545.1.fa.gz"
+      # unzip reference into renamed file
+      gunzip -c GCF_014621545.1.fa.gz > reference_genome.fasta
+      echo "DEBUG: finished downloading mpox data"
+    elif [ "~{organism}" == "sars-cov-2" ]; then
+      echo "DEBUG: organism is sars-cov-2, downloading latest UShER data"
+      wget "https://hgdownload.soe.ucsc.edu/goldenPath/wuhCor1/UShER_SARS-CoV-2/public-latest.all.masked.pb.gz"
+      # unzip protobuf file into renamed file
+      gunzip -c public-latest.all.masked.pb.gz > mutation.annotated.tree.pb
+
+      # download versioning information of protobuf
+      wget "https://hgdownload.soe.ucsc.edu/goldenPath/wuhCor1/UShER_SARS-CoV-2/public-latest.version.txt"
+      cat public-latest.version.txt > PROTOBUF_VERSION
+      
+      # copy the usher SC2 reference to expected name
+      cp /HOME/usher/test/NC_045512v2.fa reference_genome.fasta
+      echo "DEBUG: finished downloading sars-cov-2 data"
+    elif [ "~{organism}" == "RSV-A" ]; then
+      echo "DEBUG: organism is RSV-A, downloading latest UShER data"
+      wget "https://hgdownload.soe.ucsc.edu/hubs/GCF/002/815/475/GCF_002815475.1/UShER_RSV-A/rsvA.latest.pb.gz"
+      # unzip protobuf file into renamed file
+      gunzip -c rsvA.latest.pb.gz > mutation.annotated.tree.pb
+
+      # download versioning information of protobuf
+      wget "https://hgdownload.soe.ucsc.edu/hubs/GCF/002/815/475/GCF_002815475.1/UShER_RSV-A/rsvA.latest.version.txt"
+      cat rsvA.latest.version.txt > PROTOBUF_VERSION
+
+      # download RSV-A reference used to make usher protobuf
+      wget "https://hgdownload.soe.ucsc.edu/hubs/GCF/002/815/475/GCF_002815475.1/GCF_002815475.1.fa.gz"
+      # unzip reference into renamed file
+      gunzip -c GCF_002815475.1.fa.gz > reference_genome.fasta
+      echo "DEBUG: finished downloading RSV-A data"
+    elif [ "~{organism}" == "RSV-B" ]; then
+      echo "DEBUG: organism is RSV-B, downloading latest UShER data"
+      wget "https://hgdownload.soe.ucsc.edu/hubs/GCF/000/855/545/GCF_000855545.1/UShER_RSV-B/rsvB.latest.pb.gz"
+      # unzip protobuf file into renamed file
+      gunzip -c rsvB.latest.pb.gz > mutation.annotated.tree.pb
+
+      # download versioning information of protobuf
+      wget "https://hgdownload.soe.ucsc.edu/hubs/GCF/000/855/545/GCF_000855545.1/UShER_RSV-B/rsvB.latest.version.txt"
+      cat rsvB.latest.version.txt > PROTOBUF_VERSION
+
+      # download RSV-B reference used to make usher protobuf
+      wget "https://hgdownload.soe.ucsc.edu/hubs/GCF/000/855/545/GCF_000855545.1/GCF_000855545.1.fa.gz"
+      # unzip reference into renamed file
+      gunzip -c GCF_000855545.1.fa.gz > reference_genome.fasta
+      echo "DEBUG: finished downloading RSV-B data"
+    else
+      echo "DEBUG: organism is unknown, assuming user-provided data"
+      echo "User-provided protobuf file" > PROTOBUF_VERSION
+      # rename provided protobuf and reference
+      mv "~{mutation_annotated_tree_pb}" mutation.annotated.tree.pb
+      mv "~{reference_genome}" reference_genome.fasta
+      echo "DEBUG: finished renaming user-provided data"
+    fi
+
+    echo "DEBUG: concatenating assembly files"
+    for file in ~{sep=' ' assembly_fasta}; do
+      cat "${file}" >> all_sequences.fasta
+    done
+
+    echo "DEBUG: generating MSA"
+    mafft --thread 10 --auto --keeplength --addfragments all_sequences.fasta reference_genome.fasta > all_sequences.aligned.fasta
+
+    echo "DEBUG: converting MSA to VCF"
+    faToVcf all_sequences.aligned.fasta all_sequences.merged.vcf
+
+    # capture usher version
+    usher --version > VERSION
+
+    echo "DEBUG: running UShER"
+    usher \
+      --load-mutation-annotated-tree mutation.annotated.tree.pb \
+      --vcf all_sequences.merged.vcf \
+      --write-uncondensed-final-tree \
+      --write-subtrees-size ~{subtree_size}
+
+    echo "DEUBG: UShER finished, renaming files"
+    mv uncondensed-final-tree.nh ~{tree_name}_uncondensed-final-tree.nwk
+    mv clades.txt ~{tree_name}_clades.txt
+
+    # rename subtree files to .nwk extension
+    for file in *nh; do
+      mv "$file" "$(basename -- "$file" .nh).nwk"
+    done
+
+  >>>
+  output {
+    File usher_uncondensed_tree = "~{tree_name}_uncondensed-final-tree.nwk"
+    File usher_clades = "~{tree_name}_clades.txt"
+    Array[File] usher_subtrees = glob("subtree-*.nwk")
+    Array[File] usher_subtree_mutations = glob("subtree-*-mutations.txt")
+    String usher_version = read_string("VERSION")
+    String usher_protobuf_version = read_string("PROTOBUF_VERSION")
+  }
+  runtime {
+    docker: docker
+    memory: memory + " GB"
+    cpu :  cpus
+    disks:  "local-disk " + disk_size + " HDD"
+    disk: disk_size + " GB"
+    preemptible: 0
+    dx_instance_type: "mem3_ssd1_v2_x4"
+  }
+}
\ No newline at end of file
diff --git a/workflows/phylogenetics/wf_usher.wdl b/workflows/phylogenetics/wf_usher.wdl
new file mode 100644
index 000000000..fa10afb2f
--- /dev/null
+++ b/workflows/phylogenetics/wf_usher.wdl
@@ -0,0 +1,33 @@
+version 1.0
+
+import "../../tasks/phylogenetic_inference/task_usher.wdl" as usher_task
+import "../../tasks/task_versioning.wdl" as versioning
+
+workflow usher_workflow {
+  meta {
+    description: "Place samples onto global tree"
+  }
+  input {
+    Array[File] assembly_fasta
+    String tree_name
+    String organism # currently available: "sars-cov-2", "mpox", "RSV-A", "RSV-B"
+  }
+  call usher_task.usher {
+    input: 
+      assembly_fasta = assembly_fasta,
+      tree_name = tree_name,
+      organism = organism
+  }
+  call versioning.version_capture {
+  }
+  output {
+    File usher_uncondensed_tree = usher.usher_uncondensed_tree
+    File usher_clades = usher.usher_clades
+    Array[File] usher_subtrees = usher.usher_subtrees
+    Array[File] usher_subtree_mutations = usher.usher_subtree_mutations
+    String usher_version  = usher.usher_version
+    String usher_protobuf_version = usher.usher_protobuf_version 
+    String usher_phb_version = version_capture.phb_version
+    String usher_phb_analysis_date = version_capture.date
+  }
+}
\ No newline at end of file